Mattermost versions 10.5.x <= 10.5.7, 9.11.x <= 9.11.16 fail to negotiate a new token when accepting the invite which allows a user that intercepts both invite and password to send synchronization payloads to the server that originally created the invite via the REST API.
{ "severity": "LOW", "github_reviewed": true, "github_reviewed_at": "2025-07-21T18:50:07Z", "nvd_published_at": "2025-07-18T12:15:23Z", "cwe_ids": [ "CWE-522" ] }