{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "7.260701.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6c1114ce8ce8f3a9d9b8c82dfff3a3a462e5dc1f"
            },
            {
              "fixed": "522a28a62155999c76af026f53ede202b934fd0a"
            }
          ],
          "repo": "https://github.com/opencti-platform/opencti",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-f6pj-3m32-q934"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76820.json"
  },
  "details": "OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 7.260701.0, the synchronizerFetch GraphQL query called fetchRemoteStreams after checking only that a remote stream URL used HTTP or HTTPS. The backend did not apply the ingestion deny list or reject private, loopback, and link-local destinations, allowing an authenticated account with the INGESTION capability to make OpenCTI request internal services and cloud metadata endpoints. Returned connection errors could distinguish open HTTP ports, open non-HTTP ports, and closed ports, enabling internal network scanning, while compatible endpoint responses could disclose internal data. This issue is fixed in version 7.260701.0.",
  "id": "CVE-2026-76820",
  "modified": "2026-09-18T03:30:50.892682564Z",
  "published": "2026-09-15T19:40:39.727Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260701.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76820.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-f6pj-3m32-q934"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-76820"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OpenCTI-Platform/opencti/commit/6c1114ce8ce8f3a9d9b8c82dfff3a3a462e5dc1f"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OpenCTI-Platform/opencti/pull/16617"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenCTI: Synchronizer SSRF: stream fetch has no URL validation"
}