CVE-2026-21514: Microsoft Office Word Reliance on Untrusted Inputs in a Security Decision Vulnerability

High severity, CVSS 7.8. Actively exploited: in CISA KEV since 2026-02-10. EPSS: 1.6% chance of exploitation in the next 30 days.

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

Affected products

• Microsoft 365 Apps: affected versions not specified
• Microsoft Office Long Term Servicing Channel: version 2021 only; version 2024 only

Published 2026-02-10. Last modified 2026-06-17.