VU#754548: Cinnamon's kotaemon contains improper authorization checks in Kotaemon multi‑user chat handlers

Overview Cinnamon's Kotaemon (all versions up to v0.12.0) multi‑user chat interface does not verify conversation ownership when loading a conversation. Any authenticated user can read, delete, rename, or overwrite another user’s conversation data by supplying the correct ID. This results in high‑impact confidentiality, integrity, and availability violations. …