CERT-FR flags actively exploited Office RCE flaw
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CERT-FR warns of 140+ Microsoft Office vulnerabilities including CVE-2026-96951, which Microsoft confirms is being actively exploited in the wild.
CERT-FR has published an advisory covering a very large batch of Microsoft Office vulnerabilities disclosed in Microsoft's October 13, 2026 security bulletins. The flaws span Microsoft 365 Apps for Enterprise (32/64-bit), Office LTSC 2021 and 2024 (Windows and Mac), Office for Android, Office Online Server, and Outlook.com. Collectively the vulnerabilities enable remote code execution, privilege escalation, information disclosure, denial of service, and security feature bypass.
Of particular note, Microsoft has confirmed that CVE-2026-96951 is being actively exploited in the wild, making it the priority patch item for defenders running affected Office builds. The remaining CVEs (well over 100 identifiers) appear to be a routine, if unusually large, consolidated patch cycle with no other confirmed in-the-wild exploitation noted by CERT-FR.
CERT-FR's guidance is standard: apply the vendor-supplied patches referenced in the Microsoft Security Response Center bulletins for each CVE. Organizations should prioritize deployment of the fix for CVE-2026-96951 given confirmed active exploitation, then roll out the remaining updates across all affected Office editions and platforms per normal patch management cycles.
Mentioned in this report
Source reporting: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1312
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