SB2026011376 - Privilege escalation in Microsoft Windows Installer
Published: January 13, 2026
Security Bulletin ID
SB2026011376
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-20816)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a time-of-check, time-of-use (TOCTOU) race condition in Windows Installer. A local user can gain elevated privileges on the target system.
Remediation
Install update from vendor's website.