CVE-2026-3471
Published:May 18, 2026
Updated:June 11, 2026
Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent an invalid URL from loading in a pop-up window in the Mattermost Desktop App which allows a malicious server owner to repeated crash the application via calling {{window.open('javascript:alert()');}}. Mattermost Advisory ID: MMSA-2026-00618
Affected Packages
https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) >=v <v5.13.5Fix Suggestion:
Update to version v5.13.5https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) >=v6.0.0 <v6.1.1Fix Suggestion:
Update to version v6.1.1github.com/mattermost/desktop (GO):
Affected version(s) >=v <v5.13.5Fix Suggestion:
Update to version v5.13.5github.com/mattermost/desktop (GO):
Affected version(s) >=v6.0.0 <v6.1.1Fix Suggestion:
Update to version v6.1.1Related Resources (1)
Do you need more information?
Contact UsCVSS v4
Base Score:
7.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Improper Authorization in Handler for Custom URL Scheme
EPSS
Base Score:
0.04