highpatchedexploited in the wild

Microsoft Office Security Feature Bypass Vulnerability

Microsoft Office

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. Added to CISA KEV on 2026-01-26 (federal deadline 2026-02-16).

First seen

26 Jan 2026

Last update

26 Jan 2026, 12:00 UTC

Identifiers

• CVE-2026-21509

Source

CISA KEV

On the menu as

• Microsoft Office

Totalone hot coffee