CVE-2026-40366CWE-416

Microsoft Word Remote Code Execution Vulnerability

High · published May 12, 2026

CVSS v3.1
8.4
EPSS
0%
Percentile
29.1
In the wild
Unconfirmed
What it is

Access of resource using incompatible type ('type confusion') in Microsoft Office Word allows an unauthorized attacker to execute code locally.

The record
Technical detail
CVSS v3.1
8.4 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.00364 · 29.1th percentile
Weakness
CWE-416 · Use After Free
Published
2026-05-12T16:58Z
EPSS history
Timeline
  • 12 MAY 16:58Z
    Microsoft Word Remote Code Execution Vulnerability
    cvelistv5