CVE-2026-1046
February 16, 2026
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 Packages
https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) >=6.1.0-nightly.20251019 <6.1.0-nightly.20260111Fix Suggestion:
Update to version 6.1.0-nightly.20260111Related Resources (1)
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Contact UsCVSS v4
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
NONE
Subsequent System Availability
LOW
CVSS v3
Base Score:
7.6
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Improper Authorization in Handler for Custom URL Scheme
EPSS
Base Score:
0.04
