Microsoft Office Outlook Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (see the release notes linked in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems (+4 more)Fix see release notes
What you should do
If you run the affected products, install Microsoft's update (see the release notes linked in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 9.8
Type
Security updates
Services
Microsoft 365 Apps
Tags
Microsoft Office Outlook, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Windows Active Directory Domain Services Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation More Likely. Microsoft publishes a customer-installable fix (KB5127648, KB5126835, KB5126836 and others listed in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems (+30 more)Fix KB5127648, KB5126835, KB5126836 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5127648, KB5126835, KB5126836 and others listed in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Incorrect authorization in Active Directory Domain Services allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.1
Type
Security updates
Tags
Active Directory Domain Services, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation More Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft Office PowerPoint Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (see the release notes linked in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems (+7 more)Fix see release notes
What you should do
If you run the affected products, install Microsoft's update (see the release notes linked in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Services
Microsoft 365 Apps
Tags
Microsoft Office PowerPoint, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Windows Remote Desktop Services Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126651, KB5126655, KB5126646 and 3 more).
Severity CriticalExploited NoDisclosed NoAffects Windows Server 2012, Windows Server 2012 (Server Core installation) (+10 more)Fix KB5126651, KB5126655, KB5126646 and 3 more
What you should do
If you run the affected products, install Microsoft's update (KB5126651, KB5126655, KB5126646 and 3 more); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft PostScript Printer Driver Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126835, KB5126836, KB5126868 and others listed in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems (+30 more)Fix KB5126835, KB5126836, KB5126868 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5126835, KB5126836, KB5126868 and others listed in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Microsoft PostScript Printer Driver allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 9.8
Type
Security updates
Tags
Microsoft PostScript Printer Driver, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft PostScript Printer Driver Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5127648, KB5126646, KB5126835 and others listed in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems (+30 more)Fix KB5127648, KB5126646, KB5126835 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5127648, KB5126646, KB5126835 and others listed in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Microsoft PostScript Printer Driver allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 9.8
Type
Security updates
Tags
Microsoft PostScript Printer Driver, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Network Device Enrollment Service (NDES) Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126835, KB5126836, KB5126868 and 3 more).
Severity CriticalExploited NoDisclosed NoAffects Windows Server 2012, Windows Server 2012 (Server Core installation) (+10 more)Fix KB5126835, KB5126836, KB5126868 and 3 more
What you should do
If you run the affected products, install Microsoft's update (KB5126835, KB5126836, KB5126868 and 3 more); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Weak authentication in Network Device Enrollment Service (NDES) allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.1
Type
Security updates
Tags
Network Device Enrollment Service (NDES), Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Windows Reliable Multicast Transport Driver (RMCAST) Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Unlikely. Microsoft publishes a customer-installable fix (KB5122876, KB5122882, KB5122878 and others listed in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems (+28 more)Fix KB5122876, KB5122882, KB5122878 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5122876, KB5122882, KB5122878 and others listed in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over an adjacent network.
Severity
Critical · CVSS 7.5
Type
Security updates
Tags
Reliable Multicast Transport Driver (RMCAST), Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Unlikely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Linux Kernel Elevation of Privilege Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (see the release notes linked in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Linux 3P (Third Party) DistrosFix see release notes
What you should do
If you run the affected products, install Microsoft's update (see the release notes linked in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Time-of-check time-of-use (toctou) race condition in Linux Kernel allows an authorized attacker to elevate privileges locally.
Severity
Critical
Type
Security updates
Tags
Linux Kernel, Elevation of Privilege, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Raw Image Extension Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (see the release notes linked in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Raw Image Extension on Windows 10 Version 1607 for 32-bit Systems, Raw Image Extension on Windows 10 Version 1607 for x64-based Systems (+22 more)Fix see release notes
What you should do
If you run the affected products, install Microsoft's update (see the release notes linked in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Windows Raw Image Extension allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 9.8
Type
Security updates
Tags
Windows Raw Image Extension, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126651).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems (+2 more)Fix KB5126651
What you should do
If you run the affected products, install Microsoft's update (KB5126651); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Untrusted pointer dereference in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Windows Virtualization-Based Security (VBS) Enclave, Elevation of Privilege, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft PostScript Printer Driver Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126835, KB5126836, KB5126868 and others listed in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems (+30 more)Fix KB5126835, KB5126836, KB5126868 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5126835, KB5126836, KB5126868 and others listed in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Microsoft PostScript Printer Driver allows an authorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Microsoft PostScript Printer Driver, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Windows Message Queuing Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126835, KB5126836, KB5126868 and others listed in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems (+30 more)Fix KB5126835, KB5126836, KB5126868 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5126835, KB5126836, KB5126868 and others listed in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Use after free in Windows Message Queuing allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.1
Type
Security updates
Tags
Windows Message Queuing, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft Windows PDF Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126653, KB5126657, KB5126655 and 1 more).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems (+10 more)Fix KB5126653, KB5126657, KB5126655 and 1 more
What you should do
If you run the affected products, install Microsoft's update (KB5126653, KB5126657, KB5126655 and 1 more); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Out-of-bounds write in Microsoft Windows PDF allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.1
Type
Security updates
Tags
Microsoft Windows PDF, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
HEVC Video Extensions Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (see the release notes linked in the advisory).
Severity CriticalExploited NoDisclosed NoAffects HEVC Video Extensions, HEVC Video Extensions for Licensed Applications (+22 more)Fix see release notes
What you should do
If you run the affected products, install Microsoft's update (see the release notes linked in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Integer overflow or wraparound in Microsoft Windows Codecs Library allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Microsoft Windows Codecs Library, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Windows Hyper-V Elevation of Privilege Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5127648, KB5126651, KB5126655 and others listed in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems (+30 more)Fix KB5127648, KB5126651, KB5126655 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5127648, KB5126651, KB5126655 and others listed in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.
Severity
Critical · CVSS 7.2
Type
Security updates
Tags
Windows Hyper-V, Elevation of Privilege, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
.NET Framework Security Feature Bypass Vulnerability. Microsoft rates it Important; not reported as exploited; publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126868, KB5127666, KB5127685 and others listed in the advisory).
Severity ImportantExploited NoDisclosed YesAffects Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows 10 version 1607, Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2016 (+22 more)Fix KB5126868, KB5127666, KB5127685 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5126868, KB5127666, KB5127685 and others listed in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix and reports it as publicly disclosed, so it matters if you run the affected products.
Untrusted search path in .NET Framework allows an authorized attacker to bypass a security feature locally.
Severity
Important · CVSS 8.8
Type
Security updates
Tags
.NET Framework, Security Feature Bypass, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: Yes · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Important) is Microsoft's rating and is not treated as proof that action is needed.
Active Directory Federation Services (AD FS) Spoofing Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126835, KB5126836, KB5126868 and others listed in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems (+30 more)Fix KB5126835, KB5126836, KB5126868 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5126835, KB5126836, KB5126868 and others listed in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
No cwe for this issue in Active Directory Federation Services (AD FS) allows an unauthorized attacker to perform spoofing over a network.
Severity
Critical · CVSS 7.5
Type
Security updates
Tags
Active Directory Federation Services (AD FS), Spoofing, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5127648, KB5126646, KB5127646).
Severity CriticalExploited NoDisclosed NoAffects Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems (+8 more)Fix KB5127648, KB5126646, KB5127646
What you should do
If you run the affected products, install Microsoft's update (KB5127648, KB5126646, KB5127646); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
Severity
Critical · CVSS 7.8
Type
Security updates
Tags
Windows Virtualization-Based Security (VBS) Enclave, Elevation of Privilege, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Windows Hyper-V Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126657, KB5126655, KB5126653 and 3 more).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 21H2 for 32-bit Systems, Windows 10 Version 21H2 for ARM64-based Systems (+18 more)Fix KB5126657, KB5126655, KB5126653 and 3 more
What you should do
If you run the affected products, install Microsoft's update (KB5126657, KB5126655, KB5126653 and 3 more); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Improper access control in Windows Hyper-V allows an authorized attacker to execute code locally.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Windows Hyper-V, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft Excel Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5002928 and release notes).
Severity CriticalExploited NoDisclosed NoAffects Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems (+8 more)Fix KB5002928
What you should do
If you run the affected products, install Microsoft's update (KB5002928 and release notes); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Services
Microsoft 365 Apps
Tags
Microsoft Office Excel, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft QUIC Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5126655, KB5126653, KB5127648 and others listed in the advisory and release notes).
Severity CriticalExploited NoDisclosed NoAffects .NET 10.0 runtime installed on Windows, .NET 11.0 runtime installed on Windows (+18 more)Fix KB5126655, KB5126653, KB5127648 and others listed in the advisory
What you should do
If you run the affected products, install Microsoft's update (KB5126655, KB5126653, KB5127648 and others listed in the advisory and release notes); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Microsoft QUIC allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 9.8
Type
Security updates
Tags
Microsoft QUIC, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft Office SharePoint Elevation of Privilege Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5002927).
Severity CriticalExploited NoDisclosed NoAffects Microsoft SharePoint Server Subscription EditionFix KB5002927
What you should do
If you run the affected products, install Microsoft's update (KB5002927); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Improper verification of cryptographic signature in Microsoft Office SharePoint allows an unauthorized attacker to elevate privileges over a network.
Severity
Critical · CVSS 8.1
Type
Security updates
Services
SharePoint
Tags
Microsoft Office SharePoint, Elevation of Privilege, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft Office Visio Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (see the release notes linked in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems (+4 more)Fix see release notes
What you should do
If you run the affected products, install Microsoft's update (see the release notes linked in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Microsoft Office Visio allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Services
Microsoft 365 Apps
Tags
Microsoft Office Visio, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.
Microsoft Office Visio Remote Code Execution Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (see the release notes linked in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Microsoft 365 Apps for Enterprise for 32-bit Systems, Microsoft 365 Apps for Enterprise for 64-bit Systems (+4 more)Fix see release notes
What you should do
If you run the affected products, install Microsoft's update (see the release notes linked in the advisory); the advisory lists the exact build per product. from Microsoft's advisory data
Why: Microsoft lists a customer-installable fix, so it matters if you run the affected products.
Heap-based buffer overflow in Microsoft Office Visio allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Services
Microsoft 365 Apps
Tags
Microsoft Office Visio, Remote Code Execution, 2026-Oct
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: update published
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (Critical) is Microsoft's rating and is not treated as proof that action is needed.