Virtual Hard Disk (VHD) Miniport 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 (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 Virtual Hard Disk (VHD) Miniport Driver allows an authorized attacker to execute code locally.
Severity
Critical · CVSS 7.5
Type
Security updates
Tags
Virtual Hard Disk (VHD) Miniport Driver, Remote Code Execution, 2026-Sep
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 Hello 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 (KB5122876, KB5122878, KB5124008 and 2 more).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems (+16 more)Fix KB5122876, KB5122878, KB5124008 and 2 more
What you should do
If you run the affected products, install Microsoft's update (KB5122876, KB5122878, KB5124008 and 2 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.
Heap-based buffer overflow in Windows Hello allows an authorized attacker to elevate privileges locally.
Severity
Critical · CVSS 8.2
Type
Security updates
Tags
Windows Hello, Elevation of Privilege, 2026-Sep
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.
Web Media Extensions 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 (see the release notes linked in the advisory).
Severity CriticalExploited NoDisclosed NoAffects Web Media Extensions on Windows 10 Version 21H2 for 32-bit Systems, Web Media Extensions on Windows 10 Version 21H2 for ARM64-based Systems (+12 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 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-Sep
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.
Windows Hyper-V 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 (KB5122882, KB5122871, KB5124008 and 2 more).
Severity CriticalExploited NoDisclosed NoAffects Windows 11 Version 23H2 for ARM64-based Systems, Windows 11 Version 23H2 for x64-based Systems (+10 more)Fix KB5122882, KB5122871, KB5124008 and 2 more
What you should do
If you run the affected products, install Microsoft's update (KB5122882, KB5122871, KB5124008 and 2 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.
Untrusted pointer dereference 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-Sep
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.
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 (KB5002923 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 (+11 more)Fix KB5002923
What you should do
If you run the affected products, install Microsoft's update (KB5002923 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.
Use after free in Microsoft Office Outlook 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 Outlook, Remote Code Execution, 2026-Sep
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 Outlook Information Disclosure Vulnerability. Microsoft rates it Critical; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft publishes a customer-installable fix (KB5002923 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 (+11 more)Fix KB5002923
What you should do
If you run the affected products, install Microsoft's update (KB5002923 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 Outlook allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 6.5
Type
Security updates
Services
Microsoft 365 Apps
Tags
Microsoft Office Outlook, Remote Code Execution, 2026-Sep
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 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 (KB5002919 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 KB5002919
What you should do
If you run the affected products, install Microsoft's update (KB5002919 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.
Use of uninitialized resource in Microsoft Office Outlook 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 Outlook, Remote Code Execution, 2026-Sep
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 Outlook and Word 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 (KB5002916 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 (+11 more)Fix KB5002916
What you should do
If you run the affected products, install Microsoft's update (KB5002916 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 Office allows an unauthorized attacker to execute code locally.
Severity
Critical · CVSS 8.4
Type
Security updates
Services
Microsoft 365 Apps
Tags
Microsoft Office, Remote Code Execution, 2026-Sep
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 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 (KB5002923 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 (+11 more)Fix KB5002923
What you should do
If you run the affected products, install Microsoft's update (KB5002923 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 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-Sep
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 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 (KB5002916 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 (+11 more)Fix KB5002916
What you should do
If you run the affected products, install Microsoft's update (KB5002916 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 Office allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Microsoft Office, Remote Code Execution, 2026-Sep
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 Less Likely. Microsoft publishes a customer-installable fix (KB5122876, KB5122882, KB5122871).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems (+6 more)Fix KB5122876, KB5122882, KB5122871
What you should do
If you run the affected products, install Microsoft's update (KB5122876, KB5122882, KB5122871); 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 Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.1
Type
Security updates
Tags
Reliable Multicast Transport Driver (RMCAST), Remote Code Execution, 2026-Sep
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 Less Likely. 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.
Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.1
Type
Security updates
Tags
Reliable Multicast Transport Driver (RMCAST), Remote Code Execution, 2026-Sep
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 Services for NFS ONCRPC XDR 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 (KB5122876, KB5122882, KB5122871 and 3 more).
Severity CriticalExploited NoDisclosed NoAffects Windows Server 2012, Windows Server 2012 (Server Core installation) (+10 more)Fix KB5122876, KB5122882, KB5122871 and 3 more
What you should do
If you run the affected products, install Microsoft's update (KB5122876, KB5122882, KB5122871 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.
Use after free in Windows Services for NFS ONCRPC XDR Driver allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 9.8
Type
Security updates
Tags
Windows Services for NFS ONCRPC XDR Driver, Remote Code Execution, 2026-Sep
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 Failover Cluster 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 (KB5122876, KB5122882, KB5122871).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems (+6 more)Fix KB5122876, KB5122882, KB5122871
What you should do
If you run the affected products, install Microsoft's update (KB5122876, KB5122882, KB5122871); 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 Failover Cluster allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.1
Type
Security updates
Tags
Windows Failover Cluster, Remote Code Execution, 2026-Sep
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 Graphics Component 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 Office 365 for Mac, Microsoft Office LTSC for Mac 2021 (+2 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.
Stack-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Microsoft Graphics Component, Remote Code Execution, 2026-Sep
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 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 (+9 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 allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 7.5
Type
Security updates
Tags
Microsoft Office, Remote Code Execution, 2026-Sep
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 DNS Server 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 (KB5122876, KB5122882, KB5122871 and 3 more).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1607 for 32-bit Systems, Windows 10 Version 1607 for x64-based Systems (+14 more)Fix KB5122876, KB5122882, KB5122871 and 3 more
What you should do
If you run the affected products, install Microsoft's update (KB5122876, KB5122882, KB5122871 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.
Use after free in DNS Server allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.1
Type
Security updates
Tags
Role: DNS Server, Remote Code Execution, 2026-Sep
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 Word 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 (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.
Double free in Microsoft Office Word 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 Word, Remote Code Execution, 2026-Sep
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 Imaging Component 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 (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 Windows Imaging Component allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Windows Imaging Component, Remote Code Execution, 2026-Sep
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 Graphics Component 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 (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.
Double free in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 9.8
Type
Security updates
Tags
Microsoft Graphics Component, Remote Code Execution, 2026-Sep
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 Imaging Component 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 (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 Windows Imaging Component allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Windows Imaging Component, Remote Code Execution, 2026-Sep
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.
Graphic Fonts 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 (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 Graphic Fonts allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Graphic Fonts, Remote Code Execution, 2026-Sep
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.
Graphics Kernel 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 (KB5122876, KB5122882, KB5122878 and 4 more).
Severity CriticalExploited NoDisclosed NoAffects Windows 10 Version 1809 for 32-bit Systems, Windows 10 Version 1809 for x64-based Systems (+20 more)Fix KB5122876, KB5122882, KB5122878 and 4 more
What you should do
If you run the affected products, install Microsoft's update (KB5122876, KB5122882, KB5122878 and 4 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.
Heap-based buffer overflow in Windows Graphics Kernel allows an authorized attacker to execute code locally.
Severity
Critical · CVSS 7.5
Type
Security updates
Tags
Windows Graphics Kernel, Remote Code Execution, 2026-Sep
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.
DirectWrite Remote Code Execution Vulnerability. Microsoft gives no severity rating; not reported as exploited; not publicly disclosed; exploitability assessment: Exploitation Less Likely. Microsoft marks customer action as required but lists no specific update or mitigation in the advisory data.
Severity not ratedExploited NoDisclosed NoAffects not listedFix none listed
What you should do
Open the advisory to see which of your products are affected; Microsoft lists no specific update here. from Microsoft's advisory data
Why: Microsoft marks customer action as required but lists no specific update, so check whether your products are affected.
Heap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a network.
Type
Security updates
Tags
Microsoft Graphics Component, 2026-Sep
Microsoft advisory data
Customer action required: Yes · Exploited: No · Publicly disclosed: No · Exploitation Less Likely · Remediation: none listed
Classification
Derived from Microsoft's structured advisory fields, not by AI. Severity (n/a) is Microsoft's rating and is not treated as proof that action is needed.
Windows Imaging Component 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 Office for Android, Windows 10 Version 1809 for 32-bit Systems (+9 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 Imaging Component allows an unauthorized attacker to execute code over a network.
Severity
Critical · CVSS 8.8
Type
Security updates
Tags
Windows Imaging Component, Remote Code Execution, 2026-Sep
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.