---
id: CVE-2026-1046
title: >-
  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 Matte…
summary: >-
  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 Matte…
severity: high
cvss: 7.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L'
cwe:
  - CWE-939
vendor: mattermost
product: mattermost_desktop
affected:
  - 'mattermost_desktop >= 5.13.0, < 5.13.3'
  - 'mattermost_desktop >= 6.0.0, < 6.0.3'
patched:
  - mattermost_desktop 6.0.3
published: '2026-02-16'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T13:32:28.463'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-1046'
references:
  - url: 'https://mattermost.com/security-updates'
    label: responsibledisclosure@mattermost.com
tags:
  - nvd
epss: 0.00259
epssPercentile: 0.16339
ingestedAt: '2026-10-15T14:07:30.096Z'
---

## Overview

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

- `mattermost_desktop >= 5.13.0, < 5.13.3`
- `mattermost_desktop >= 6.0.0, < 6.0.3`

## Remediation

Upgrade past the affected range:

- `mattermost_desktop 6.0.3`