HIGHCVE-2026-1046Published Modified CNA Mattermost
CVE-2026-1046: Arbitrary application execution via unvalidated server-controlled URLs in Help menu
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
Metrics
- CVSS v3.1
- 7.6
- Severity
- HIGH
- Fixed in
- 5.13.3.0
- Affected Products
- 1
Fix available
5.13.3.06.0.3.06.1.0
Affected packages
- Mattermost / Mattermost≤ 6.2.0 · ≤ 5.2.13Fixed in 6.1.0, 6.0.3.0, 5.13.3.0
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:LReferences