{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "7.260326.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "f4930dd85df7e8de4a3edd8d8281ab4b856882d4"
            },
            {
              "fixed": "134531ddf5ecf741006b7f0870b7c36711b96540"
            }
          ],
          "repo": "https://github.com/opencti-platform/opencti",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-36fr-4m54-94mj"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-639",
      "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35210.json"
  },
  "details": "OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 7.260326.0, an authorization bypass vulnerability in OpenCTI allows any authenticated user with KNOWLEDGE_KNUPDATE permission to bypass Confidence Level validation and Object Marking restrictions by injecting the synchronized-upsert: true HTTP header, enabling attackers to downgrade confidence levels, remove security markings such as TLP:RED, manipulate relationships, and affect STIX object types including Indicators, ThreatActors, Malware, and Reports. This issue is fixed in version 7.260326.0.",
  "id": "CVE-2026-35210",
  "modified": "2026-07-16T03:30:51.597641539Z",
  "published": "2026-07-08T21:06:02.349Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35210.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35210"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c36711b96540"
    },
    {
      "type": "FIX",
      "url": "https://github.com/OpenCTI-Platform/opencti/pull/14243"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection"
}