Missing Authorization

Overview Affected versions of this package are vulnerable to Missing Authorization via the scheme teams API endpoint. An attacker can access private team invite links and use them to join or share access to private teams by leveraging insufficient authorization checks. Remediation Upgrade...

CVE-2026-9820 Mattermost schemes teams endpoint exposes private team invite IDs

Mattermost versions 11.7.x = 11.7.2, 10.11.x = 10.11.19 fail to sanitize team objects returned by the scheme teams endpoint, which allows a user with the User Manager role to obtain invite links for private teams and use them to join or share access to those teams via the scheme teams API...