GHSA-W388-2392-PX73 praisonai-platform: Missing authorization on member removal enables full workspace takeover by any user regardless of role

Summary Type: Authorization bypass enabling owner lockout. The DELETE /workspaces/workspaceid/members/userid endpoint is gated only by requireworkspacememberworkspaceid default minrole="member". Any member can remove any other member, including the workspace owner, using a single DELETE. There is...

PT-2026-45063

Summary Type: Authorization bypass enabling owner lockout. The DELETE /workspaces/workspace id/members/user id endpoint is gated only by require workspace memberworkspace id default min role="member". Any member can remove any other member, including the workspace owner, using a single DELETE...

CVE-2026-2458 Unauthorized channel enumeration in private teams after member removal

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2, 10.11.x = 10.11.10 fail to properly validate team membership when searching channels which allows a removed team member to enumerate all public channels within a private team via the channel search API endpoint.. Mattermost Advisory ID:...

CVE-2026-2458

Mattermost is affected by CVE-2026-2458. Affected versions include 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, and 10.11.x