OpenCTI Platform prior 7.260326.0 Authorization Validation synchronized-upsert authorization

Summaryinfo

A vulnerability was found in OpenCTI Platform OpenCTI. It has been rated as critical. This affects an unknown part of the component Authorization Validation. The manipulation of the argument synchronized-upsert leads to authorization. This vulnerability is uniquely identified as CVE-2026-35210. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in OpenCTI Platform OpenCTI. It has been rated as critical. This issue affects an unknown function of the component Authorization Validation. The manipulation of the argument synchronized-upsert with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-35210 since 04/01/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 7.260326.0 eliminates this vulnerability.

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• OpenCTI Platform

Name

• OpenCTI

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