CVE-2026-21509

HIGH7.8

CISA KEV

Published 2026-01-26 · Updated 2026-06-25 · Source secure@microsoft.com

Description

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

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

CWE-807

CISA Known-Exploited Vulnerability

Product: Microsoft — Office

Name: Microsoft Office Security Feature Bypass Vulnerability

Date added: 2026-01-26 · Due: 2026-02-16

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

View on NVD

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