CVE-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
- 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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Exploitation outlook
- Low exploitation risk0.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
Advisory coverage (1)
- highCVE-2026-42991: Windows Push Notifications Elevation of Privilege Vulnerabilitymsrc · 2026-06-09
External references
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[](https://www.csirts.com/cve/CVE-2026-42991)