CVE-2026-42906: Windows Shell Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-42906

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

CSIRTS triage

vendor: Microsoft product: Windows Shell Information disclosure

What: Exposure of sensitive information in Windows Shell allows an authorized attacker to disclose information locally.
Who is affected: Users of Windows Shell are affected.
Urgency: Medium urgency due to the potential for information disclosure, though no active exploitation is reported.
Action: Apply patches as they become available.

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-2026-42906

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-2026-429060.40% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-42906	coverage & exploitation status	NVD · CVE.org

Recent advisories for Windows Shell Information

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-2026-42907: Windows Shell Information Disclosure Vulnerabilitymsrc · 2026-06-09