CVE-2026-42978: Windows Push Notifications Elevation of Privilege Vulnerability

highCVSS 7.8CVE-2026-42978

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: Microsoft product: Windows Push Notifications Privilege escalation

What: A race condition in Windows Push Notifications allows an authorized attacker to elevate privileges locally.
Who is affected: Authorized users of Windows Push Notifications.
Urgency: Remediation is urgent due to the high severity rating of 7.8 and potential for privilege escalation.
Action: Install the security update for Windows Push Notifications.

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-2026-42978

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.

Low exploitation riskCVE-2026-429780.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-42978	coverage & exploitation status	NVD · CVE.org

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.

mediumCVE-2026-42969: Windows Push Notification Information Disclosure Vulnerabilitymsrc · 2026-06-09
mediumCVE-2026-42971: Windows Push Notification Information Disclosure Vulnerabilitymsrc · 2026-06-09
mediumCVE-2026-42970: Windows Push Notification Information Disclosure Vulnerabilitymsrc · 2026-06-09
mediumCVE-2026-42973: Windows Push Notification Information Disclosure Vulnerabilitymsrc · 2026-06-09
highCVE-2026-42977: Windows Push Notifications Elevation of Privilege Vulnerabilitymsrc · 2026-06-09
highCVE-2026-42979: Windows Push Notifications Elevation of Privilege Vulnerabilitymsrc · 2026-06-09