CVE-2026-20920 json
Win32k Elevation of Privilege Vulnerability
published 2026-01-13 9 mo ago modified 2026-07-30 3 mo ago also EUVD-2026-2137
- cvss
- 7.8
- 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 42%
- public exploits
- 0
- none known
Summary
Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.
Patch / fix
- Microsoft Windows 11 version 23H2 10.0.22631.6491
- Microsoft Windows Server 2022 10.0.20348.4648
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2092
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 9 mo ago
Exploit prediction
0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C |
| CNA | 3.1 | 7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Microsoft Windows 11 version 23H2
- Microsoft Windows Server 2022
- Microsoft Windows Server 2022, 23H2 Edition (Server Core installation)
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-20920
vendor-advisory, patch
Sources
- CVE List CVE-2026-20920
- NVD CVE-2026-20920
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