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CVE-2026-42991: Windows Push Notifications Elevation of Privilege Vulnerability

highCVSS 7.8CVE-2026-42991
Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Push Notifications allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Push NotificationsPrivilege escalation
What
Concurrent execution using shared resource with improper synchronization in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
Who is affected
Authorized users of Windows Push Notifications on affected Windows systems.
Urgency
Remediation is high urgency due to the high severity and lack of exploitation status.
Action
Apply the latest security updates for Windows.

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-2026-42991

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-2026-42991coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows Push Notifications

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