{"id":"CVE-2026-35210","state":"PUBLISHED","title":"OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection","description":"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.","publishedAt":"2026-07-08T21:06:02.349Z","updatedAt":"2026-07-09T13:45:43.275Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["OpenCTI-Platform opencti"],"affected":[{"vendor":"OpenCTI-Platform","product":"opencti","versions":[{"version":"< 7.260326.0","status":"affected"}]}],"references":["https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj","https://github.com/OpenCTI-Platform/opencti/pull/14243","https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c36711b96540","https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0"],"weaknesses":["CWE-639","CWE-863"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/35xxx/CVE-2026-35210.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-35210","state":"PUBLISHED","datePublished":"2026-07-08T21:06:02.349Z","dateUpdated":"2026-07-09T13:45:43.275Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-01T18:48:58.937Z"},"containers":{"cna":{"title":"OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"OpenCTI-Platform","product":"opencti","versions":[{"version":"< 7.260326.0","status":"affected"}]}],"references":[{"url":"https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj","name":"https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/OpenCTI-Platform/opencti/pull/14243","name":"https://github.com/OpenCTI-Platform/opencti/pull/14243","tags":["x_refsource_MISC"]},{"url":"https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c36711b96540","name":"https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c36711b96540","tags":["x_refsource_MISC"]},{"url":"https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0","name":"https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-863","lang":"en","description":"CWE-863: Incorrect Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-08T21:06:02.349Z"},"source":{"advisory":"GHSA-36fr-4m54-94mj","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-09T13:45:35.902145Z","id":"CVE-2026-35210","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-09T13:45:43.275Z"}}]}}}