Cinnamon's kotaemon contains improper authorization checks in multi‑user chat handlers

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Cinnamon's Kotaemon (all versions up to and including v0.12.0) multi-user chat interface contains multiple vulnerabilities due to incorrect authorization and improper access controls. There are four handler methods in `libs/ktem/ktem/pages/chat/control.py` that load a Conversation record by its ID without comparing the requester's `user_id` to the conversation's owner `Conversation.user`. This allows any authenticated user to perform the following actions: 1. Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions. 2. Permanently delete another user's conversation. 3. Rename another user's conversation. 4. Overwrite another user's conversation's chat suggestion list.

Source published

23 Sep 2026 17:44:52 UTC

Source modified

24 Sep 2026 14:37:20 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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