CVE-2026-3433 | Mattermost up to 11.6.x Websocket Connection information disclosure

June 12, 2026 Yanac

A vulnerability categorized as problematic has been discovered in Mattermost up to 10.11.15/10.11.16/11.5.4/11.6.1/11.6.x. Affected is an unknown function of the component Websocket Connection Handler. The manipulation results in information disclosure.

This vulnerability is cataloged as CVE-2026-3433. The attack may be launched remotely. There is no exploit available.

It is advisable to upgrade the affected component.VulDB Recent EntriesRead More