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How the CVE Works
Mattermost fails to enforce proper permission checks when team administrators attempt to modify team invite settings. The vulnerability exists in the `/api/v4/teams/:teamId/privacy` endpoint, where insufficient validation allows administrators without the “invite user” permission to alter team invite IDs. This could lead to unauthorized changes in team privacy settings, allowing attackers to manipulate invite links and gain unintended access. The flaw affects versions 10.7.0-rc1 to 10.7.0, 10.6.0-rc1 to 10.6.2, 10.5.0-rc1 to 10.5.3, and 9.11.x up to 9.11.12.
DailyCVE Form
Platform: Mattermost
Version: 10.7.0-10.7.0
Vulnerability: Privilege Escalation
Severity: Moderate
Date: May 29, 2025
Prediction: Patch by June 10, 2025
What Undercode Say:
Exploitation:
- Endpoint Manipulation: Attackers send crafted requests to
/api/v4/teams/:teamId/privacy. - Bypass Checks: Modify `team_id` and `privacy` fields without proper permission validation.
- Invite Hijacking: Generate or alter invite links to gain unauthorized team access.
Protection:
- Patch Immediately: Upgrade to Mattermost 10.7.1, 10.6.3, 10.5.4, or 9.11.13.
- API Hardening: Implement strict role-based checks for team privacy modifications.
- Log Monitoring: Audit logs for unexpected `/api/v4/teams/` endpoint activity.
Detection Commands:
Check Mattermost version: curl -s http://localhost:8065/api/v4/system/ping | grep version Monitor suspicious API calls: grep "/api/v4/teams/./privacy" /var/log/mattermost/access.log
Mitigation Script:
Validate team admin permissions before privacy changes:
def validate_team_privacy_change(user_id, team_id):
if not has_permission(user_id, "invite_user", team_id):
raise PermissionError("Unauthorized privacy modification attempt.")
Analytics:
- Attack Vector: Low complexity, network-exploitable.
- Impact: Unauthorized team access, data leakage.
- Patch Status: Fixed in latest releases.
- Workaround: Restrict team admin privileges temporarily.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
