CVE-2026-20876 json
Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerability
published 9mo ago modified 3mo ago also EUVD-2026-2130
- cvss
- 6.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 43%
- public exploits
- 0
- none known
Summary
Heap-based buffer overflow in Windows Virtualization-Based Security (VBS) Enclave allows an authorized attacker to elevate privileges locally.
Patch / fix
- Microsoft Windows 11 version 23H2 10.0.22631.6491
- Microsoft Windows 11 Version 24H2 10.0.26100.7623
- Microsoft Windows 11 Version 25H2 10.0.26200.7623
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2092
- Microsoft Windows Server 2025 10.0.26100.32230
- Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.32230
Is CVE-2026-20876 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 9mo ago
Exploit prediction
0.51% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 6.7 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Windows 11 version 23H2
- Microsoft Windows 11 Version 24H2
- Microsoft Windows 11 Version 25H2
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
- Microsoft Windows Server 2025
- Microsoft Windows Server 2025 (Server Core installation)
Classification
- Weakness
-
- CWE-122 Heap-based Buffer Overflow
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-20876
vendor-advisory, patch
Sources
- CVE List CVE-2026-20876
- NVD CVE-2026-20876
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.