Cinnamon AI Kotaemon up to 0.12.0 Multi-User Chat Interface control.py user_id/Conversation.user authorization

Summaryinfo

A vulnerability was found in Cinnamon AI Kotaemon up to 0.12.0. It has been declared as critical. This issue affects some unknown processing of the file libs/ktem/ktem/pages/chat/control.py of the component Multi-User Chat Interface. Executing a manipulation of the argument user_id/Conversation.user can lead to authorization. This vulnerability is tracked as CVE-2026-86867. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Cinnamon AI Kotaemon up to 0.12.0 and classified as critical. This vulnerability affects some unknown processing of the file libs/ktem/ktem/pages/chat/control.py of the component Multi-User Chat Interface. The manipulation of the argument user_id/Conversation.user with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-862. The product does not perform an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at kb.cert.org. This vulnerability was named CVE-2026-86867 since 09/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/23/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Artificial Intelligence Software

Vendor

• Cinnamon AI

Name

• Kotaemon

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12.0

CPE 2.3info

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CPE 2.2info

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