CVE-2026-45385 Open WebUI: An IDOR vulnerability exists in the update_message_by_id API endpoint

Open WebUI is a self-hosted artificial intelligence platform designed to operate entirely offline. Prior to 0.9.5, an IDOR vulnerability exists in the Channels feature of Open WebUI, allowing any channel member to modify messages sent by other members including administrators within the same...

CVE-2026-45385

Summary (grounded): Open WebUI (self-hosted offline AI) contains an IDOR vulnerability in the update_message_by_id API for channels of type group/dm. In these paths, the code only verifies that the caller is a channel member (is_user_channel_member) and does not confirm message ownership, enablin...