{"cve":"CVE-2026-35210","nvd":{"published":"2026-07-08T21:16:48.487","modified":"2026-10-25T17:10:00.197","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N","score":7.1},"cwes":["CWE-639","CWE-863"],"references":["https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c36711b96540","https://github.com/OpenCTI-Platform/opencti/pull/14243","https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0","https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj"],"products":["citeum:opencti"],"source":"nvd","synced_at":"2026-10-25T17:50:06.907763985+00:00"},"epss":{"cve":"CVE-2026-35210","score":0.00353,"percentile":0.28669,"date":"2026-10-25"},"kev":null,"osv":[{"id":"PYSEC-2026-3445","url":"https://osv.dev/vulnerability/PYSEC-2026-3445","summary":"","modified":"2026-07-14T10:45:07.597809852Z","packages":[{"ecosystem":"PyPI","name":"pycti","purl":"pkg:pypi/pycti","ranges":["<7.260326.0"],"fixed":["7.260326.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}