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Vulnerability Intelligence

Vulnerability IntelligenceCVE-2026-21509

CVE-2026-21509

HIGH7.8

Microsoft Office Security Feature Bypass Vulnerability

Published Jan 26, 2026

Modified 4 days ago

References

ADVISORYhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21509 WEBhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21509 ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2026-21509

CVSS Analysis

CVSS v3.1

7.8

Exploitability

Attack Vector

LocalAV:L

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

RequiredUI:R

Scope

Scope

UnchangedS:U

Impact

Confidentiality

HighC:H

Integrity

HighI:H

Availability

HighA:H

7.8/CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C

Weakness Type (CWE)

Other

Ecosystems

Timeline

PublishedJan 26, 2026

ModifiedJan 30, 2026

CVE-2026-21509 | Mondoo Vulnerability Intelligence