🛡️ CVE-2026-1046 — mattermost-desktop

🟠 CVSS 7.6 — High ✅ No Known Exploit CWE-939 NVD
7.6
CVSS Score
0 Low4 Medium7 High9 Critical10

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. A user must be tricked into taking some action. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality high, integrity none, availability low.

Weakness class

CVE-2026-1046 is classified as CWE-939: Improper Authorization in Handler for Custom URL Scheme. 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.

Affected software

CVE-2026-1046 is recorded against 1 package.

  • mattermost-desktop (from 6.0.0 up to 6.0.3)

Timeline and source

Published on 16 February 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

mattermost.com

Details

Severity HIGH
CVSS Score 7.6
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L
CWE CWE-939
Public Exploit ✅ No
Source NVD
Published 2026-02-16
Updated 2026-08-20
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
mattermost-desktop 6.0.0 6.0.3

References

Similar Threats

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