CVE-2026-1046
Received
Received - Intake
Arbitrary Code Execution via Help Link Validation Flaw in Mattermost Desktop
Vulnerability report for CVE-2026-1046, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-02-16
Last updated on: 2026-03-23
Assigner: Mattermost, Inc.
Description
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
CVSS Scores
EPSS Scores
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| Percentile: |
Meta Information
Affected Vendors & Products
| 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
KEV
| 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. |
