CVE-2026-86867

Summary

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.

Affected Software

VendorProductVersion RangeStatus
Cinnamon AIKotaemon0.12.0affected

Weaknesses

  • CWE-862 Missing Authorization
  • CWE-639 Authorization Bypass Through User-Controlled Key
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

ADP Enrichment

CVE Program Container

Additional References

References