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

mediumCVSS 5.5CVE-2026-42973

Exposure of sensitive information to an unauthorized actor in Windows Push Notifications allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoft product: Windows Push Notifications Information 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.

Low exploitation riskCVE-2026-429730.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 33% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-42973	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[UPDATE] [high] Microsoft Windows: Multiple vulnerabilitiescert-bund