CVE-2025-12559
November 27, 2025
Mattermost versions 11.0.x <= 11.0.2, 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12 fail to sanitize team email addresses to be visible only to Team Admins, which allows any authenticated user to view team email addresses via the GET /api/v4/channels/{channel_id}/common_teams endpoint
Affected Packages
github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v11.0.1-rc1 <v11.0.3Fix Suggestion:
Update to version v11.0.3github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.5.0 <v10.5.13Fix Suggestion:
Update to version v10.5.13github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.5.0 <v10.5.13Fix Suggestion:
Update to version v10.5.13github.com/mattermost/mattermost (GO):
Affected version(s) >=v11.0.1-rc1 <v11.0.3Fix Suggestion:
Update to version v11.0.3github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.11.0 <v10.11.5Fix Suggestion:
Update to version v10.11.5github.com/mattermost/mattermost (GO):
Affected version(s) >=v10.12.0 <v10.12.2Fix Suggestion:
Update to version v10.12.2github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.12.0 <v10.12.2Fix Suggestion:
Update to version v10.12.2github.com/mattermost/mattermost/server/v8 (GO):
Affected version(s) >=v8.0.0-20230429093631-aac4f2337933 <v8.0.0-20251015091448-abbf01b9db45Fix Suggestion:
Update to version v8.0.0-20251015091448-abbf01b9db45github.com/mattermost/mattermost-server (GO):
Affected version(s) >=v10.11.0 <v10.11.5Fix Suggestion:
Update to version v10.11.5Related Resources (10)
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)
Exposure of Sensitive Information to an Unauthorized Actor
EPSS
Base Score:
0.04
