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CVE-2026-21509

High CVSS 7.8 Known exploited

Published 2026-01-26 · last changed 2026-06-25 · added to CISA KEV 2026-01-26

This one is being exploited in the wild.

CISA added CVE-2026-21509 to the Known Exploited Vulnerabilities catalog on 2026-01-26. Federal agencies are required to remediate it on a deadline. If you have affected machines, this is the class of finding that moves ahead of the rest of the queue.

The fix

We hold no Microsoft remediation data for CVE-2026-21509, which normally means it is not a Windows CVE. For non-Microsoft software the fix is the vendor's own updated release, and the affected versions are listed below.

What it is

Reliance on untrusted inputs in a security decision in Microsoft Office allows an unauthorized attacker to bypass a security feature locally.

Sources

CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H