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CVE-2026-40420 - Vulnerability Analysis

HighCVSS: 8.8

Last Updated: May 12, 2026

Microsoft Office Click-To-Run - Privilege Escalation

Published: May 12, 2026Updated: May 12, 2026

Overview

Microsoft Office Click-To-Run contains an improper access control vulnerability, letting authorized attackers locally elevate privileges, exploit requires attacker to be authorized on the system.

Severity & Score

Severity: High

CVSS Score: 8.8

Impact

Authorized attackers can locally elevate their privileges, potentially gaining higher system access.

Mitigation

Update to the latest version of Microsoft Office Click-To-Run.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40420

Related Resources

Vulnerability Intelligence Dashboard
Credential Scanner

Details

CVE ID: CVE-2026-40420
Severity: High
CVSS Score: 8.8
Type: broken_access_control
Status: new

CWE

CWE-284

CVSS Metrics

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H