CVE-2026-86867 Details
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: 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.
A vulnerability exists in Cinnamon's Kotaemon multi-user chat interface, all versions prior to v0.12.0, due to improper authorization checks and access controls. The issue arises in four handler methods that load conversation records by ID without verifying if the requester is the conversation owner. This flaw allows any authenticated user to read, delete, rename, or overwrite another user's conversation data by using the correct conversation ID. The vulnerability exposes sensitive information such as chat transcripts and private document excerpts, and allows for unauthorized manipulation of conversation data.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 23, 2026CISA-ADP
Assessed Sep 24, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.kb.cert.org/vuls/id/754548 | CVE | AdvisoryRemedy |
| https://kb.cert.org/vuls/id/754548 | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-200 | Exposure of Sensitive Information to an Unauthorized Actor | CISA-ADP |
| CWE-639 | Authorization Bypass Through User-Controlled Key | CISA-ADP |
| CWE-862 | Missing Authorization | CISA-ADP |
Affected Products
| Product | Versions |
|---|---|
| Cinnamon Kotaemon | <= 0.12.0 (semver) |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 24, 2026 | CVE Modified | CISA-ADP |
| Sep 23, 2026 | CVE Modified | CVE |
| Sep 23, 2026 | New CVE Received | [email protected] |