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CVE-2026-86867

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

cve-program · severity unknownCVSS unknownCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-86867

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-86867

Published

Kotaemon

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Cinnamon AI",
                    "product": "Kotaemon",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0.12.0"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON