Vulnerability-Lookup

CVE-2026-86867 (GCVE-0-2026-86867)

Vulnerability from cvelistv5 – Published: 2026-09-23 17:44 – Updated: 2026-09-24 14:37

Title

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

Summary

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.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-24 14:37 UTC

CWE

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

Assigner

certcc CNA under the mitre root

CNA scorecard E 42/100 over 156 records in the last 180 days details

References

2 references

URL	Tags
https://kb.cert.org/vuls/id/754548
https://www.kb.cert.org/vuls/id/754548

Impacted products

1 product

Vendor	Product	Version	CPE status
Cinnamon AI	Kotaemon	Affected: 0.12.0	guessed

Show details on NVD website

JSON

To clipboard

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          }
        ],
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        ],
        "sourceIdentifier": "cret@cert.org",
        "vulnStatus": "Deferred",
        "weaknesses": [
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                "value": "CWE-200"
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            "type": "Secondary"
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FKIE_CVE-2026-86867

Vulnerability from fkie_nvd - Published: 2026-09-23 18:17 - Updated: 2026-09-24 15:17

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Summary

References

	URL	Tags
	cret@cert.org	https://kb.cert.org/vuls/id/754548
	af854a3a-2127-422b-91ae-364da2661108	https://www.kb.cert.org/vuls/id/754548

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Kotaemon",
          "vendor": "Cinnamon AI",
          "versions": [
            {
              "status": "affected",
              "version": "0.12.0"
            }
          ]
        }
      ],
      "source": "cret@cert.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Cinnamon\u0027s 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\u0027s `user_id` to the conversation\u0027s owner `Conversation.user`. This allows any authenticated user to perform the following actions:\r\n1. Read other user\u0027s chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.\r\n2. Permanently delete another user\u0027s conversation.\r\n3. Rename another user\u0027s conversation.\r\n4. Overwrite another user\u0027s conversation\u0027s chat suggestion list."
    }
  ],
  "id": "CVE-2026-86867",
  "lastModified": "2026-09-24T15:17:49.290",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
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  },
  "published": "2026-09-23T18:17:09.323",
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    {
      "source": "cret@cert.org",
      "url": "https://kb.cert.org/vuls/id/754548"
    },
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  "vulnStatus": "Deferred",
  "weaknesses": [
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        },
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          "value": "CWE-862"
        }
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      "type": "Secondary"
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}

GHSA-XJ3R-7J9Q-CQF2

Vulnerability from github – Published: 2026-09-23 18:31 – Updated: 2026-09-24 15:31

Details

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.

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-86867"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-23T18:17:09Z",
    "severity": "MODERATE"
  },
  "details": "Cinnamon\u0027s 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\u0027s `user_id` to the conversation\u0027s owner `Conversation.user`. This allows any authenticated user to perform the following actions:\n1. Read other user\u0027s chat transcripts, RAG retrieval history, AI-generated plots, and chat suggestions.\n2. Permanently delete another user\u0027s conversation.\n3. Rename another user\u0027s conversation.\n4. Overwrite another user\u0027s conversation\u0027s chat suggestion list.",
  "id": "GHSA-xj3r-7j9q-cqf2",
  "modified": "2026-09-24T15:31:22Z",
  "published": "2026-09-23T18:31:58Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86867"
    },
    {
      "type": "WEB",
      "url": "https://kb.cert.org/vuls/id/754548"
    },
    {
      "type": "WEB",
      "url": "https://www.kb.cert.org/vuls/id/754548"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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CVE-2026-86867 (GCVE-0-2026-86867)

FKIE_CVE-2026-86867

GHSA-XJ3R-7J9Q-CQF2

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Related by attack behaviour