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

Quick assessment

Affected
OpenCTI-Platform opencti
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenCTI是OpenCTI组织开源的一个开放网络威胁情报平台。 OpenCTI 7.260326.0之前版本存在授权问题漏洞，该漏洞源于授权绕过问题，允许具有KNOWLEDGE_KNUPDATE权限的任何已验证用户通过注入synchronized-upsert: true HTTP标头，绕过置信度级别验证和对象标记限制，从而降低置信度级别、移除安全标记（如TLP:RED）、操纵关系，并影响STIX对象类型，包括Indicator、ThreatActor、Malware和Report。

CVSS 7.1 · High EPSS 0.35% · P27

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenCTI-Platform opencti < 7.260326.0 affected
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I. Basic Information for CVE-2026-35210

Vulnerability Information
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Vulnerability Title
OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
OpenCTI 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenCTI是OpenCTI组织开源的一个开放网络威胁情报平台。 OpenCTI 7.260326.0之前版本存在授权问题漏洞，该漏洞源于授权绕过问题，允许具有KNOWLEDGE_KNUPDATE权限的任何已验证用户通过注入synchronized-upsert: true HTTP标头，绕过置信度级别验证和对象标记限制，从而降低置信度级别、移除安全标记（如TLP:RED）、操纵关系，并影响STIX对象类型，包括Indicator、ThreatActor、Malware和Report。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenCTI-Platform opencti < 7.260326.0 -

II. Public POCs for CVE-2026-35210

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9866 chars
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III. Intelligence Information for CVE-2026-35210

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Patches & Fixes for CVE-2026-35210 (2)

Vendor Advisories for CVE-2026-35210 (1)

Other References for CVE-2026-35210 (1)

IV. Related Vulnerabilities

Same product: opencti
Same vendor: OpenCTI-Platform
Same weakness: CWE-639

V. Comments for CVE-2026-35210

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