CVE tracker / CVE-2026-69820
CVE-2026-69820
CVE-2026-69820 is the Windows Hello Elevation of Privilege Vulnerability. Microsoft rates it Critical, CVSS 8.2. It is not in CISA's Known Exploited Vulnerabilities catalog. Published September 8, 2026.
Risk summary
HighElevation of Privilege
8.2
CVSS v3 base
0.3%
EPSS: chance of exploitation in 30 days
High
Severity
Critical
Microsoft's rating
Unlikely
Microsoft: exploitation
No
In CISA KEV
Microsoft describes it: “Heap-based buffer overflow in Windows Hello allows an authorized attacker to elevate privileges locally.”
How to fix it
Microsoft lists 14 affected products and the update that fixes each:
- KB5122878 · fixed build 10.0.19045.7725, 10.0.19044.7725
Windows 10 Version 22H2 for 32-bit Systems, Windows 10 Version 22H2 for x64-based Systems, Windows 10 Version 22H2 for ARM64-based Systems, Windows 10 Version 21H2 for x64-based Systems, Windows 10 Version 21H2 for ARM64-based Systems, and 1 more - KB5122880 · fixed build 10.0.22631.7582
Windows 11 Version 23H2 for x64-based Systems, Windows 11 Version 23H2 for ARM64-based Systems - KB5124008 · fixed build 10.0.26100.9445, 10.0.26200.9445
Windows 11 Version 24H2 for x64-based Systems, Windows 11 Version 24H2 for ARM64-based Systems, Windows 11 Version 25H2 for x64-based Systems, Windows 11 Version 25H2 for ARM64-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.
Details
- Weakness
- CWE-122: Heap-based Buffer Overflow
- Publicly disclosed (Microsoft)
- No
- Exploited (Microsoft)
- No
- Known exploited (CISA KEV)
- Not listed
- Published
- September 8, 2026
- Last revised
- September 8, 2026
Get told when this changes
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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.