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

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Summary

CVECVE-2026-35210
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-08 21:16:48 UTC
Updated2026-07-13 14:46:34 UTC
DescriptionOpenCTI 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.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

EPSS: 0.002690000 probability, percentile 0.186120000 (date 2026-07-13)

Problem Types: CWE-639 | CWE-863 | CWE-639 CWE-639: Authorization Bypass Through User-Controlled Key | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Citeum Opencti All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenCTI-Platform Opencti affected < 7.260326.0 Not specified

References

ReferenceSourceLinkTags
github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c... [email protected] github.com Patch
github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0 [email protected] github.com Product, Release Notes
github.com/OpenCTI-Platform/opencti/pull/14243 [email protected] github.com Issue Tracking, Patch
github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj [email protected] github.com Vendor Advisory
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