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CVE-2026-54115: Windows Message Queuing (MSMQ) Elevation of Privilege Vulnerability

highCVSS 7.8CVE-2026-54115
Integer overflow or wraparound in Windows Active Directory allows an authorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Message Queuing (MSMQ)Privilege escalation
What
Integer overflow or wraparound in Windows Active Directory allows an authorized attacker to elevate privileges locally.
Who is affected
Authorized users of Windows Message Queuing (MSMQ).
Urgency
Remediation is urgent due to the high severity and potential for privilege escalation.
Action
Apply the latest security patch for Windows Message Queuing.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54115

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-2026-54115coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

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