CVE-2026-40359CWE-416

Microsoft Excel Remote Code Execution Vulnerability

High · published May 12, 2026

CVSS v3.1

7.8

EPSS

0%

Percentile

39.4

In the wild

Unconfirmed

What it is

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

The record

Technical detail

CVSS v3.1: 7.8 · HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0: Not supplied
EPSS: 0.00466 · 39.4th percentile
Weakness: CWE-416 · Use After Free
Published: 2026-05-12T16:59Z

EPSS history

Timeline

12 MAY 16:59Z
Microsoft Excel Remote Code Execution Vulnerability
cvelistv5