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CVE-2026-86867

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

6.5 Medium

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 15th percentile. No source names a fixed version.

What does this mean?
Severity
6.5 MediumCVSS 3.1, CVE List
Exploit chance
0.24%EPSS, 15th percentile
Exploitation
None knownNot on CISA’s or ENISA’s lists
Fixed in
No fix listedNo source names one

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.

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

0.24%Up 0.1 points since Sep 24, 2026
90%50%10%1%

Affected products

What each source reports

CVE List Score used6.5

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:

  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.
Record
CVE-2026-86867
CVSS 3.1
6.5 MediumCVSS: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-2026-855086.5

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.
Record
EUVD-2026-85508
CVSS 3.1
6.5 MediumCVSS: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-cqf26.5

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:

  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.
Record
GHSA-xj3r-7j9q-cqf2
CVSS 3.1
6.5 MediumCVSS: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
NVD6.5

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.
Record
CVE-2026-86867
CVSS 3.1
6.5 MediumCVSS: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

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

References

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