Review reviewHigh

CVE-2026-42910

Microsoft Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1

Out-of-bounds write in Windows Hotpatch Monitoring Service allows an authorized attacker to elevate privileges locally.

PRIORITY ASSESSMENT

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.29%

Technical severityCVSS 7.8

Out-of-bounds write in Windows Hotpatch Monitoring Service allows an authorized attacker to elevate privileges locally.

Product: Microsoft Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1
Affected versions: >= 10.0.26100.0 < 10.0.26100.8655, >= 10.0.26200.0 < 10.0.26200.8655, >= 10.0.28000.0 < 10.0.28000.2269, >= 10.0.26100.0 < 10.0.26100.32995, < 10.0.26100.8655, < 10.0.26200.8655, < 10.0.28000.2269, < 10.0.26100.32995
Fixed versions: 10.0.26100.8655, 10.0.26200.8655, 10.0.28000.2269, 10.0.26100.32995

Confirm exposure before applying a vendor-supported change.

1
Identify
Confirm that Microsoft Windows 11 Version 24H2, Windows 11 Version 25H2, Windows 11 version 26H1 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.