CVE tracker / CVE-2026-69401
CVE-2026-69401
CVE-2026-69401 is the Audio Video Control Transport Protocol Elevation of Privilege Vulnerability. Microsoft rates it Important, CVSS 7.0. It is not in CISA's Known Exploited Vulnerabilities catalog. Published September 8, 2026.
Risk summary
Microsoft describes it: “Use after free in Audio Video Control Transport Protocol allows an authorized attacker to elevate privileges locally.”
How to fix it
Microsoft lists 8 affected products and the update that fixes each:
- KB5122871 · fixed build 10.0.26100.33438
Windows Server 2025 (Server Core installation), Windows Server 2025 - KB5124008 · fixed build 10.0.26200.9445, 10.0.26100.9445
Windows 11 Version 25H2 for ARM64-based Systems, Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems - KB5124012 · fixed build 10.0.28000.2954
Windows 11 Version 26H1 for ARM64-based Systems, Windows 11 version 26H1 for x64-based Systems
What Microsoft changed
- September 8, 2026: Information published.
- October 6, 2026: Updated an acknowledgement. This is an informational change only.
Details
- Weakness
- CWE-416: Use After Free
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- September 8, 2026
- Last revised
- October 6, 2026
Get told when this changes
Senserva Watch emails Microsoft security and patch alerts when something moves: a new exploitation report, a revised fix, a known issue. Free, one email address.
References
From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.