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CVE-2026-45594: Windows Application Identity (AppID) Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-45594
Exposure of sensitive information to an unauthorized actor in Windows Application Identity (AppID) Subsystem allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Application IdentityInformation disclosure
What
Exposure of sensitive information to an unauthorized actor in Windows Application Identity Subsystem allows an authorized attacker to disclose information locally.
Who is affected
Authorized attackers with access to the system can exploit this vulnerability.
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-2026-45594

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-2026-45594coverage & exploitation statusNVD · CVE.org

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