CVE-2026-21509

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

The following products are affected by CVE-2026-21509 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-21509.

URL	Resource
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21509
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21509
https://www.vicarius.io/vsociety/posts/cve-2026-21509-detection-script-microsoft-office-security-feature-bypass-vulnerability
https://www.vicarius.io/vsociety/posts/cve-2026-21509-mitigation-script-microsoft-office-security-feature-bypass-vulnerability