CVE-2025-13821 | Mattermost up to 10.11.9/11.1.2/11.2.1 WebSocket Message information disclosure (EUVD-2025-206981)
A vulnerability marked as problematic has been reported in Mattermost up to 10.11.9/11.1.2/11.2.1. This affects an unknown function of the component WebSocket Message Handler. This manipulation causes information disclosure.
The identification of this vulnerability is CVE-2025-13821. It is possible to initiate the attack remotely. There is no exploit available.
It is suggested to upgrade the affected component.