CVE-2026-1046CWE-939

CVE-2026-1046

High · published February 16, 2026

CVSS v3.1
7.6
EPSS
0%
Percentile
16.6
In the wild
Unconfirmed
What it is

Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user’s system via the user clicking on certain items in the Help menu Mattermost Advisory ID: MMSA-2026-00577

The record
Technical detail
CVSS v3.1
7.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L
CVSS v4.0
Not supplied
EPSS
0.00259 · 16.6th percentile
Weakness
CWE-939 · Improper Authorization in Handler for Custom URL Scheme
Published
2026-02-16T18:16Z
Affected products (2)
ProductVersionsFixed in
mattermost/mattermost_desktop≥ 5.13.0, < 5.13.35.13.3
mattermost/mattermost_desktop≥ 6.0.0, < 6.0.36.0.3
References (1)
https://mattermost.com/security-updates · [email protected]
EPSS history
Timeline
  • 16 FEB 12:10Z
    Arbitrary application execution via unvalidated server-controlled URLs in Help menu
    cvelistv5