CVE-2026-45604: Windows Managed Installer Information Disclosure Vulnerability

mediumCVSS 5.5CVE-2026-45604

Out-of-bounds read in Windows Application Identity (AppID) Subsystem allows an authorized attacker to disclose information locally.

CSIRTS triage

vendor: Microsoft product: Windows Information disclosure

What: An out-of-bounds read allows an authorized attacker to disclose information locally.
Who is affected: Users of Windows with the Application Identity (AppID) Subsystem.
Urgency: Remediation is medium urgency due to the moderate severity of the vulnerability.
Action: Apply the latest security updates for Windows.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Windows

Get an email when a new Windows advisory drops — max one per day, one-click unsubscribe.

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-2026-45604

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-2026-456040.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-45604	coverage & exploitation status	NVD · CVE.org

Recent advisories for Windows Managed Installer

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.

criticalexploitedCVE-2024-38014: Microsoft Windows Installer Improper Privilege Management Vulnerabilitycisa-kev · 2024-09-10