{"id":"CVE-2026-35210","title":"OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables","summary":"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 t…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","cwe":["CWE-639","CWE-863"],"vendor":"citeum","product":"opencti","affected":["opencti < 7.260326.0"],"patched":["opencti 7.260326.0"],"published":"2026-07-08","updated":"2026-07-13","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-35210","references":[{"url":"https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c36711b96540","label":"security-advisories@github.com"},{"url":"https://github.com/OpenCTI-Platform/opencti/pull/14243","label":"security-advisories@github.com"},{"url":"https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0","label":"security-advisories@github.com"},{"url":"https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00353,"epssPercentile":0.29027,"ingestedAt":"2026-07-13T15:27:34.340Z","slug":"CVE-2026-35210","body":"## Overview\n\nOpenCTI 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.\n\n## Affected\n\n- `opencti < 7.260326.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `opencti 7.260326.0`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}