SB2026021056 - Privilege escalation in Microsoft Windows Storage
Published: February 10, 2026
Security Bulletin ID
SB2026021056
CSH 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 vulnerability.
1) Improper Authentication (CVE-ID: CVE-2026-21508)
CWE-ID: CWE-287 - Improper Authentication
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
The vulnerability allows a local user to bypass authentication process.
The vulnerability exists due to an error in when processing authentication requests in Windows Storage. A local user can bypass authentication process and gain elevated privileges on the target system.
Remediation
Install update from vendor's website.