CVE-2026-40420

Published May 12, 2026

Last updated 13 hours ago

Overview

Description
Improper access control in Microsoft Office Click-To-Run allows an authorized attacker to elevate privileges locally.
Source
secure@microsoft.com
NVD status
Analyzed
Products
365_apps, office, office_long_term_servicing_channel

Risk scores

CVSS 3.1

Type
Primary
Base score
8.8
Impact score
6
Exploitability score
2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Severity
HIGH

Weaknesses

secure@microsoft.com
CWE-284

Social media

Hype score
Not currently trending

Configurations

References

Sources include official advisories and independent security research.