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CVE-2026-42973: Windows Push Notification Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-42973
Use of uninitialized resource in Windows Push Notifications allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Push NotificationsInformation disclosure
What
An authorized attacker can disclose information locally due to the use of uninitialized resources.
Who is affected
Authorized users of Windows Push Notifications are affected.
Urgency
Remediation is medium urgency due to the potential for information disclosure.
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
medium — CVSS 5.5
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42973

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-2026-42973coverage & exploitation statusNVD · CVE.org

Recent advisories for Windows Push Notification

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