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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-86867
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 18:17:09 UTC
Updated2026-09-24 15:17:49 UTC
DescriptionCinnamon'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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from ADP

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS: 0.001370000 probability, percentile 0.025260000 (date 2026-09-24)

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

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cinnamon AI Kotaemon affected 0.12.0 Not specified

References

ReferenceSourceLinkTags
www.kb.cert.org/vuls/id/754548 af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
kb.cert.org/vuls/id/754548 [email protected] kb.cert.org
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