CVE-2025-14350
February 16, 2026
Mattermost versions 11.1.x <= 11.1.2, 10.11.x <= 10.11.9, 11.2.x <= 11.2.1 fail to properly validate team membership when processing channel mentions which allows authenticated users to determine the existence of teams and their URL names via posting channel shortlinks and observing the channel_mentions property in the API response. Mattermost Advisory ID: MMSA-2025-00563
Affected Packages
github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.1.0 <v11.1.2Fix Suggestion:
Update to version v11.1.2github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.2.0 <v11.2.2Fix Suggestion:
Update to version v11.2.2github.com/mattermost/mattermost/server/v8 (GO):
Affected version(s) >=v8.0.0-20230429093631-aac4f2337933 <v8.0.0-20251209134645-761e56bb11ccFix Suggestion:
Update to version v8.0.0-20251209134645-761e56bb11ccgithub.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.10Fix Suggestion:
Update to version v10.11.10Related Resources (5)
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:
0.03
