Kotaemon Missing Ownership Check in Conversation Functions

{
  "id": "b78d47ee8fb3cd7a23645cc34ea3405dede4a7edb8fd6c40b7cf5e87addf6ee9",
  "url": "https://osv.dev/vulnerability/CVE-2026-82281",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Kotaemon Missing Ownership Check in Conversation Functions",
    "summary": "Kotaemon through 0.12.0 fails to properly validate conversation ownership in select_conv, delete_conv, rename_conv, and on_set_public_conversation functions in control.py. Attackers can read other users' chat histories, delete conversations, or rename conversations by supplying arbitrary conversation identifiers without proper authorization checks.",
    "evidence": "osv:CVE-2026-82281",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-82281",
      "aliases": [
        "CVE-2026-82281"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/cinnamon/kotaemon",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "9ad3e4e49aa35b8acddd235918a5d9753c1cfdf9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.12.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.12.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.12.0",
            "v0.11.4",
            "v0.11.3",
            "v0.11.2",
            "v0.11.1",
            "v0.11.0",
            "v0.10.7",
            "v0.10.6",
            "v0.10.5",
            "v0.10.4",
            "v0.10.3",
            "v0.10.2",
            "v0.10.1",
            "v0.10.0",
            "v0.9.11",
            "v0.9.10",
            "v0.9.9",
            "v0.9.8",
            "v0.9.7",
            "v0.9.6",
            "v0.9.5",
            "v0.9.4",
            "v0.9.3",
            "v0.9.2",
            "v0.9.1",
            "v0.9.0",
            "v0.8.3",
            "v0.8.2",
            "v0.8.1",
            "v0.8.0",
            "v0.7.9",
            "v0.7.8",
            "v0.7.7",
            "v0.7.6",
            "v0.7.5",
            "v0.7.4",
            "v0.7.3",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.6.12",
            "v0.6.11",
            "v0.6.10",
            "v0.6.9",
            "v0.6.8",
            "v0.6.7",
            "v0.6.6",
            "v0.6.5",
            "v0.6.4",
            "v0.6.3",
            "v0.6.2",
            "v0.6.1",
            "v0.6.0",
            "v0.5.3",
            "v0.5.2",
            "v0.5.1",
            "v0.5.0",
            "v0.4.15",
            "v0.4.14",
            "v0.4.13",
            "v0.4.12",
            "v0.4.11",
            "v0.4.10",
            "v0.4.9",
            "v0.4.8",
            "v0.4.7",
            "v0.4.6",
            "v0.4.5",
            "v0.4.4",
            "v0.4.3",
            "v0.4.2",
            "v0.4.1",
            "v0.4.0",
            "v0.3.6",
            "v0.3.5",
            "v0.3.4",
            "v0.3.3",
            "v0.3.2",
            "v0.3.1",
            "v0.3.0",
            "v0.2.0",
            "v0.1.0",
            "v0.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82281.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.812508352Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82281.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-82281",
        "https://www.vulncheck.com/advisories/kotaemon-missing-ownership-check-in-conversation-functions",
        "https://github.com/Cinnamon/kotaemon/issues/846",
        "https://github.com/Cinnamon/kotaemon",
        "https://github.com/Cinnamon/kotaemon/blob/9ad3e4e49aa35b8acddd235918a5d9753c1cfdf9/libs/ktem/ktem/pages/chat/control.py"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82281.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-82281",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488239,
  "published_at": "2026-08-28T16:19:01.076+00:00"
}