PatchSiren cyber security CVE debrief
CVE-2026-42910 Microsoft CVE debrief
CVE-2026-42910 is a HIGH severity vulnerability in Windows Hotpatch Monitoring Service that allows an authorized attacker to elevate privileges locally. The vulnerability has a CVSS score of 7.8 and was published on [cvePublishedAt](https://www.cve.org/CVERecord?id=CVE-2026-42910) 2026-06-09. The vulnerability affects multiple versions of Windows 11 and Windows Server 2025.
- Vendor
- Microsoft
- Product
- Windows Hotpatch Monitoring Service
- CVSS
- HIGH 7.8
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-09
- Original CVE updated
- 2026-06-11
- Advisory published
- 2026-06-09
- Advisory updated
- 2026-06-11
Who should care
Administrators and users of affected Windows systems should apply patches to mitigate this vulnerability.
Technical summary
The vulnerability is an out-of-bounds write in Windows Hotpatch Monitoring Service, which allows an authorized attacker to elevate privileges locally. The vulnerability has been assigned a CVSS vector of CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Defensive priority
HIGH
Recommended defensive actions
- Apply patches from Microsoft as soon as possible.
- Review and update vulnerability management processes to ensure timely patching of affected systems.
Evidence notes
The vulnerability is based on information from the National Vulnerability Database (NVD) and Microsoft's security advisories.
Official resources
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CVE-2026-42910 CVE record
CVE.org
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CVE-2026-42910 NVD detail
NVD
-
Source item URL
nvd_modified
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Mitigation or vendor reference
[email protected] - Vendor Advisory
CVE-2026-42910 was published on 2026-06-09 and modified on 2026-06-11.