CVE-2026-9162 | Mattermost up to 11.7.x Websocket Connection session expiration (WID-SEC-2026-1650)

A vulnerability classified as problematic has been found in Mattermost up to 10.11.17/11.5.5/11.6.2/11.7.0/11.7.x. This affects an unknown part of the component Websocket Connection Handler. Performing a manipulation results in session expiration. This vulnerability was named CVE-2026-9162. The attack may be initiated remotely. There is no available exploit. It is recommended to upgrade the affected component.