CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2026-55136: Microsoft Excel Remote Code Execution Vulnerability

highCVSS 7.8CVE-2026-55136
Untrusted pointer dereference in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CSIRTS triage

vendor: Microsoftproduct: ExcelRemote code execution
What
A remote code execution vulnerability in Microsoft Excel allows unauthorized attackers to execute code locally.
Who is affected
Users of Microsoft Excel are affected by this vulnerability.
Urgency
This is a high severity vulnerability that requires prompt remediation.
Action
Users should apply the latest security updates for Microsoft Excel.

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

⚡ Watch Excel

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

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-2026-55136

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-2026-55136coverage & 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