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CVE-2026-54131: Microsoft Excel Remote Code Execution Vulnerability

highCVSS 7.8CVE-2026-54131
Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CSIRTS triage

vendor: Microsoftproduct: ExcelRemote code execution
What
A use after free vulnerability in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
Who is affected
Users of Microsoft Excel are affected by this vulnerability.
Urgency
Remediation is urgent due to the high severity and potential for exploitation of this vulnerability.
Action
Users should update Microsoft Excel to the latest version.

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 7.8
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54131

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-2026-54131coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for Microsoft Excel Remote

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