CVE-2026-35210

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 v3 7.1 HIGH

7.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c36711b96540	Patch
https://github.com/OpenCTI-Platform/opencti/pull/14243	Issue Tracking Patch
https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0	Product Release Notes
https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:citeum:opencti:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-08 21:16

Updated : 2026-07-13 14:46

NVD link : CVE-2026-35210

Mitre link : CVE-2026-35210

CVE.ORG link : CVE-2026-35210

JSON object : View

Products Affected

citeum

opencti

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

CWE-863

Incorrect Authorization

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