CVE-2026-20838
Windows Kernel Information Disclosure Vulnerability
Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Windows Kernel Information Disclosure Vulnerability
Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.
- Record
CVE-2026-20838- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Weakness
- CWE-209
- Updated
- 2026-11-02
EUVDEUVD-2026-2176
Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.
- Record
EUVD-2026-2176- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-6j3g-2jh3-q8rg
Generation of error message containing sensitive information in Windows Kernel allows an...
Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.
- Record
GHSA-6j3g-2jh3-q8rg- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-209
- Updated
- 2026-11-02
NVD
Generation of error message containing sensitive information in Windows Kernel allows an authorized attacker to disclose information locally.
- Record
CVE-2026-20838- CVSS 3.1
- 5.5 Medium
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-209
- Updated
- 2026-11-02
Affected products
- microsoft windows 11 version 23h2
- microsoft windows 11 version 24h2
- microsoft windows 11 version 25h2
- microsoft windows server 2022
- microsoft windows server 2022, 23h2 edition (server core installation)
- microsoft windows server 2025
- microsoft windows server 2025 (server core installation)
- microsoft windows 11 23h2
- microsoft windows 11 24h2
- microsoft windows 11 25h2
- microsoft windows server 2022 23h2
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-20838 is a medium vulnerability (CVSS 5.5) in Microsoft Windows 11 Version 23h2, published January 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.65%, the 51st percentile. No source names a fixed version.