Vulnerability details

CVE-2026-35210

OpenCTI-Platform opencti

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

CVSS 3.1

7.1High

Official 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 scores

Score	Version	Source	Vector
7.1High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N`

Affected products

Vendor	Product	Versions	Source
OpenCTI-Platform	opencti	< 7.260326.0	CVEProject cvelistV5 (CNA)

References and advisories

https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj x_refsource_CONFIRM
https://github.com/OpenCTI-Platform/opencti/pull/14243 x_refsource_MISC
https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c36711b96540 x_refsource_MISC
https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0 x_refsource_MISC

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Details

Published: 2026-07-09
Last updated: 2026-07-09
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.35%

Probability of exploitation in 30 days

29.1%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: None
Technical impact: Partial

Weaknesses (CWE)

CWE-639
Authorization Bypass Through User-Controlled Key
CWE-863
Incorrect Authorization