CVE-2026-1046: Arbitrary application execution via unvalidated server-controlled URLs in Help menu

Published Feb 16, 2026
·
Updated

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

Affected Software

3 affected components
Mattermost Mattermost Desktop App<=6.0, <=6.2.0, <=5.2.13.0
Mattermost Mattermost Desktop>=5.13.2<5.13.3
Mattermost Mattermost Desktop>=6.0.0<6.0.3

Remediation

Information

Update Mattermost Desktop App to versions 6.1.0, 6.0.3.0, 5.13.3.0 or higher.

Event History

Feb 16, 2026
CVE Published
via MITRE·12:10 PM
Data Sourced
via MITRE·12:10 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·01:16 PM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-1046?

CVE-2026-1046 is considered to have a high severity due to its potential for arbitrary code execution on user systems.

2

How do I fix CVE-2026-1046?

To mitigate CVE-2026-1046, update the Mattermost Desktop App to a version newer than 6.2.0.

3

Who is affected by CVE-2026-1046?

Users of Mattermost Desktop App versions 5.2.13.0, 6.0, and 6.2.0 are affected by CVE-2026-1046.

4

What type of vulnerability is CVE-2026-1046?

CVE-2026-1046 is an arbitrary code execution vulnerability caused by unvalidated server-controlled URLs.

5

How can attackers exploit CVE-2026-1046?

Attackers can exploit CVE-2026-1046 by crafting malicious help links that execute arbitrary executables on a user's system.

Company

Resources

Contact

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