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CVE-2026-50381: Composite Image File System driver (cimfs.sys) Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-50381
Access of resource using incompatible type ('type confusion') in Composite Image File System Driver allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoftproduct: Composite Image File SystemInformation disclosure
What
Access of resource using incompatible type ('type confusion') in Composite Image File System Driver allows an authorized attacker to disclose information locally.
Who is affected
Authorized users of systems utilizing Composite Image File System.
Urgency
Remediation is medium urgency due to the risk of information disclosure.
Action
Apply the latest updates for the Composite Image File System driver.

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
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50381

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-2026-50381coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Composite Image File

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