CVE-2026-86867
Cinnamon's kotaemon contains improper authorization checks in multi‑user chat handlers
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:
- Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.
- Permanently delete another user's conversation.
- Rename another user's conversation.
- Overwrite another user's conversation's chat suggestion list.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Cinnamon's kotaemon contains improper authorization checks in multi‑user chat handlers
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:
- Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.
- Permanently delete another user's conversation.
- Rename another user's conversation.
- Overwrite another user's conversation's chat suggestion list.
- Record
CVE-2026-86867- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-862, CWE-639, CWE-200
- Updated
- 2026-11-02
EUVDEUVD-2026-85508
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:
- Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.
- Permanently delete another user's conversation.
- Rename another user's conversation.
- Overwrite another user's conversation's chat suggestion list.
- Record
EUVD-2026-85508- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-xj3r-7j9q-cqf2
Cinnamon's Kotaemon (all versions up to and including v0.12.0) multi-user chat interface contains...
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:
- Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.
- Permanently delete another user's conversation.
- Rename another user's conversation.
- Overwrite another user's conversation's chat suggestion list.
- Record
GHSA-xj3r-7j9q-cqf2- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-200
- Updated
- 2026-11-02
NVD
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:
- Read other user's chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.
- Permanently delete another user's conversation.
- Rename another user's conversation.
- Overwrite another user's conversation's chat suggestion list.
- Record
CVE-2026-86867- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - Weakness
- CWE-200, CWE-639, CWE-862
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-86867 is a medium vulnerability (CVSS 6.5) in Cinnamon Kotaemon, published September 23, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 14th percentile. No source names a fixed version.