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Vulnerabilities

Vulnerability · CVE-2026-86867

VU#754548: Cinnamon's Kotaemon contains improper authorization checks in Kotaemon multi‑user chat handlers

Published Sep 23, 2026 · CERT/CC

Check if you run it

No confirmed exploitation is on record for CVE-2026-86867. EPSS is 0.18%. Act only if a listed version of CERT/CC is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.18%
Remediation
Not established
Affected products
CERT/CC

Overview Cinnamon's Kotaemon (all versions up to v0.12.0) multi‑user chat interface does not verify conversation ownership when loading a conversation. Any authenticated user can read, delete, rename, or overwrite another user’s conversation data by supplying the correct ID. This results in high‑impact confidentiality, integrity, and availability violations. Description Cinnamon's Kotaemon is an open‑source, retrieval‑augmented generation (RAG) based tool that lets you build a chatbot capable of "chatting with your documents". As discu

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-86867

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-86867. EPSS is 0.18%. Act only if a listed version of CERT/CC is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.18%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 23, 2026 · CERT/CC Vulnerability Notes

    Detected

    Overview Cinnamon's Kotaemon (all versions up to v0.12.0) multi‑user chat interface does not verify conversation ownership when loading a conversation. Any authenticated user can read, delete, rename, or overwrite another user’s conversation data by supplying the correct ID. This results in high‑impact confidentiality, integrity, and availability violations. Description Cinnamon's Kotaemon is an o

Sources

  • CERT/CC Vulnerability NotesGovernment advisoryCVE-2026-86867

    Overview Cinnamon's Kotaemon (all versions up to v0.12.0) multi‑user chat interface does not verify conversation ownership when loading a conversation. Any authenticated user can read, delete, rename, or overwrite another user’s conversation data by supplying the correct ID. This

    kb.cert.org
  • CVE.orgVulnerability recordCVE-2026-86867

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-86867

    30-day exploitation probability 0.2%

    first.org

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.