CVE

CVE-2026-21509

Microsoft Office Security Feature Bypass Vulnerability

Microsoft · Office

Date added (CISA)

2026-01-26

Remediation due

2026-02-16

Known ransomware use

Not indicated

Remediation priority

P2 — past CISA due date

ATT&CK mapping

No ATT&CK mapping yet

The CTID Mappings Explorer hasn't published an exploitation/impact technique mapping for this CVE yet.