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CVE-2026-50439: Microsoft Message Queuing Queue Manager Remote Code Execution Vulnerability

highCVSS 8.1CVE-2026-50439
Use after free in Microsoft Message Queuing Queue Manager allows an unauthorized attacker to execute code over a network.

CSIRTS triage

vendor: Microsoftproduct: Microsoft Message Queuing Queue ManagerRemote code execution
What
Use after free in Microsoft Message Queuing Queue Manager allows an unauthorized attacker to execute code over a network.
Who is affected
Unauthorized users targeting Microsoft Message Queuing Queue Manager deployments.
Urgency
Remediation is urgent due to the high severity rating and potential for remote code execution.
Action
Apply the latest security patch provided by 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
high — CVSS 8.1
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50439

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-2026-50439coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Microsoft Message Queuing

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