CVE-2026-40410CWE-416

Windows SMB Client Elevation of Privilege Vulnerability

High · published May 12, 2026

CVSS v3.1

7.0

EPSS

0%

Percentile

17.3

In the wild

Unconfirmed

What it is

Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally.

The record

Technical detail

CVSS v3.1: 7.0 · HIGH
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0: Not supplied
EPSS: 0.00264 · 17.3th percentile
Weakness: CWE-416 · Use After Free
Published: 2026-05-12T16:58Z

EPSS history

Timeline

12 MAY 16:58Z
Windows SMB Client Elevation of Privilege Vulnerability
cvelistv5