CVE-2025-41443
Published:October 16, 2025
Updated:May 17, 2026
Mattermost versions 10.5.x <= 10.5.12, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when accessing channel information which allows guest users to discover active public channels and their metadata via the "/api/v4/teams/{team_id}/channels/ids" endpoint
Affected Packages
github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.5.0 <v10.5.11Fix Suggestion:
Update to version v10.5.11github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.5.0 <v10.5.11Fix Suggestion:
Update to version v10.5.11github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.11.0 <v10.11.3Fix Suggestion:
Update to version v10.11.3github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.3Fix Suggestion:
Update to version v10.11.3Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Missing Authorization
EPSS
Base Score:
0.01