{"id":"CVE-2026-86867","published":"2026-09-23T18:17:09.323","lastModified":"2026-09-24T15:17:49.290","description":"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:\r\n1. Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.\r\n2. Permanently delete another user's conversation.\r\n3. Rename another user's conversation.\r\n4. Overwrite another user's conversation's chat suggestion list.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","cwes":["CWE-200","CWE-639","CWE-862"],"vendors":[],"products":[],"references":[{"url":"https://kb.cert.org/vuls/id/754548","tags":[]},{"url":"https://www.kb.cert.org/vuls/id/754548","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}