cve-2026-21509-office_security_bypass_reproduction

CVE-2026-21509 — Microsoft Office Security Feature Bypass CVE-2026-21509 is a Microsoft Office security feature bypass vulnerability CVSS 7.8 , actively exploited by APT28 Russian hackers against Ukraine Reliance on untrusted inputs in security decisions CWE-807 — "breaking the kill bit" Allows...

Exploit for Reliance on Untrusted Inputs in a Security Decision in Microsoft

CVE-2026-21509 — Microsoft Office Security Feature Bypass -...

Exploit for Reliance on Untrusted Inputs in a Security Decision in Microsoft

CVE-2026-21509 — Microsoft Office OLE Security-Feature Bypass...

Microsoft Office Zero-Day (CVE-2026-21509) - Emergency Patch Issued for Active Exploitation

Microsoft on Monday issued out-of-band security patches for a high-severity Microsoft Office zero-day vulnerability exploited in attacks. The vulnerability, tracked as CVE-2026-21509 , carries a CVSS score of 7.8 out of 10.0. It has been described as a security feature bypass in Microsoft Office...