CVE-2026-40420CWE-284

Microsoft Office Click-To-Run Elevation of Privilege Vulnerability

High · published May 12, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
21.3
In the wild
Unconfirmed
What it is

Use after free in Microsoft Office allows an authorized attacker to elevate privileges locally.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00298 · 21.3th percentile
Weakness
CWE-284 · Improper Access Control
Published
2026-05-12T16:59Z
EPSS history
Timeline
  • 12 MAY 16:59Z
    Microsoft Office Click-To-Run Elevation of Privilege Vulnerability
    cvelistv5