Vulnerability 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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Citeum | Opencti | < 7.260326.0 |
Related Weaknesses (CWE)
References
- https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7cPatch
- https://github.com/OpenCTI-Platform/opencti/pull/14243Issue TrackingPatch
- https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0ProductRelease Notes
- https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-9Vendor Advisory
FAQ
What is CVE-2026-35210?
CVE-2026-35210 is a vulnerability with a CVSS score of 7.1 (HIGH). 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...
How severe is CVE-2026-35210?
CVE-2026-35210 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-35210?
Check the references section above for vendor advisories and patch information. Affected products include: Citeum Opencti.