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CVE-2026-42905: Windows DWM Core Library Elevation of Privilege Vulnerability

highCVSS 7.8CVE-2026-42905
Use after free in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows DWM Core LibraryPrivilege escalation
What
Use after free in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.
Who is affected
Authorized users of Windows DWM Core Library.
Urgency
Remediation is urgent due to the high severity and potential for local privilege escalation.
Action
Apply the latest security updates from Microsoft.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42905

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-42905coverage & exploitation statusNVD · CVE.org

Recent advisories for Windows DWM Core

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center