Browse / CVEs / CVE-2026-21509
CVE-2026-21509· microsoft / office· CWE-807
Microsoft Office Security Feature Bypass Vulnerability
Exploited in the wild. Listed by CISA on 2026-01-26; known to be used by ransomware.
70.8%likelihood of exploitation, next 30 days
99%of all CVEs are less likely
Nonecheck to confirm it
Microsoft Office contains a security feature bypass vulnerability in which reliance on untrusted inputs in a security decision in Microsoft Office could allow an unauthorized attacker to bypass a security feature locally. Some of the impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.
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References
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