SB2026011370 - Information disclosure in Microsoft Desktop Window Manager
Published: January 13, 2026
Security Bulletin ID
SB2026011370
CSH Severity
High
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Information disclosure (CVE-ID: CVE-2026-20805)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:A/U:Amber
The vulnerability allows a local user to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the Desktop Windows Manager. A local user can gain access to a section address from a remote ALPC port, which is user-mode memory.
Note, the vulnerability is being actively exploited in the wild.
Remediation
Install update from vendor's website.