CVE-2026-4643
Published:May 18, 2026
Updated:June 11, 2026
Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Mattermost Desktop App which allows a malicious server or plugin to crash the desktop client via invoking {{window.close()}} in the renderer context, leading to a denial of service condition at the client level. Mattermost Advisory ID: MMSA-2026-00633
Affected Packages
https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) >=v6.0.0 <v6.1.1Fix Suggestion:
Update to version v6.1.1https://github.com/mattermost/desktop.git (GITHUB):
Affected version(s) >=v <v5.13.5Fix Suggestion:
Update to version v5.13.5github.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:
5.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Weakness Type (CWE)
Improper Check for Unusual or Exceptional Conditions
EPSS
Base Score:
0.03