CVE-2026-1046
Received Received - Intake
Arbitrary Code Execution via Help Link Validation Flaw in Mattermost Desktop

Publication date: 2026-02-16

Last updated on: 2026-03-23

Assigner: Mattermost, Inc.

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
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Meta Information
Published
2026-02-16
Last Modified
2026-03-23
Generated
2026-06-16
AI Q&A
2026-02-16
EPSS Evaluated
2026-06-14
NVD
CVE-2026-1046
EUVD
EUVD-2026-6090
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
mattermost mattermost_desktop From 6.0.0 (inc) to 6.0.3 (exc)
mattermost mattermost_desktop From 5.13.2 (inc) to 5.13.3 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-939 The product uses a handler for a custom URL scheme, but it does not properly restrict which actors can invoke the handler using the scheme.
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Executive Summary

This vulnerability exists in Mattermost Desktop App versions up to 6.0, 6.2.0, and 5.2.13.0. The application fails to properly validate help links, which allows a malicious Mattermost server to execute arbitrary executables on a user's system if the user clicks on certain items in the Help menu.

Impact Analysis

The vulnerability can lead to arbitrary code execution on the user's system. This means that an attacker controlling a malicious Mattermost server could potentially run harmful programs on the user's device when the user interacts with specific Help menu items, potentially compromising system security and data integrity.

Compliance Impact

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Detection Guidance

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