CVE advisoryKnown Exploit
CVE-2026-21509
Microsoft Office Security Feature Bypass Vulnerability
Halo Surface Signal: 1 out of 5 — much less likely to be public-facing.
Microsoft Office has a vulnerability allowing local security feature bypass. This impacts organizations using affected Microsoft Office products, potentially exposing data and systems to unauthorized access or modification. The business risk involves a loss of confidentiality, integrity, or availability of sensitive in