Home
HIGH: 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:LDefault status
unaffected
Any version
affected
Any version
affected
6.1.0
unaffected
6.0.3.0
unaffected
5.13.3.0
unaffected
Description
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
Problem types
CWE-939: Improper Authorization in Handler for Custom URL Scheme
Product status
Any version
Any version
6.1.0
6.0.3.0
5.13.3.0
Credits
hackerman70000
References
mattermost.com/security-updates (MMSA-2026-00577)