CVE-2026-35210 OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection

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 KNOWLEDGEKNUPDATE permission to bypass Confidence Level validation and Object Marking...

CVE-2026-35210

Summary: OpenCTI prior to version 7.260326.0 contains an authorization bypass via the synchronized-upsert: true HTTP header, exploitable by any authenticated user with KNOWLEDGE_KNUPDATE permission. This allows bypassing Confidence Level validation and Object Marking restrictions, enabling attack...