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Vulnerabilities CVE-2026-21509

CVE-2026-21509

High
Open
KEV
TLP:CLEAR

Microsoft Office Security Feature Bypass Vulnerability

NVD CVE.org
Ransomware

AI Analysis

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Description

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.

Details

CVSS Score
7.8
EPSS Score
72.15%

99.4th percentile

CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
Confidence
100%
Published
Jan 26, 2026
Last Modified
Jul 30, 2026
CISA KEV
Date Added
Jan 26, 2026
Patch Due
Feb 16, 2026
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.
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