SB2026061257 - Privilege escalation in Microsoft Windows Hotpatch Monitoring Service
Published: June 12, 2026
Security Bulletin ID
SB2026061257
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) Out-of-bounds write (CVE-ID: CVE-2026-42910)
CWE-ID: CWE-787 - Out-of-bounds write
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/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 compromise vulnerable system.
The vulnerability exists due to a boundary error when processing untrusted input in Windows Hotpatch Monitoring Service. A local user can trigger an out-of-bounds write and gain elevated privileges on the target system.
Remediation
Install update from vendor's website.