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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

PUBLISHED Reserved 2026-01-16 | Published 2026-02-16 | Updated 2026-02-16 | Assigner Mattermost




HIGH: 7.6CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L

Problem types

CWE-939: Improper Authorization in Handler for Custom URL Scheme

Product status

Default status
unaffected

Any version
affected

Any version
affected

6.1.0
unaffected

6.0.3.0
unaffected

5.13.3.0
unaffected

Credits

hackerman70000 finder

References

mattermost.com/security-updates (MMSA-2026-00577) vendor-advisory

cve.org (CVE-2026-1046)

nvd.nist.gov (CVE-2026-1046)

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