CVE-2026-35210— OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (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 POCPremium
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
- CVE-2026-35211
OpenCTI: Elasticsearch Painless Script Injection via GraphQL - CVE-2026-35212
OpenCTI has XSS in the rendering of email-message observable - CVE-2026-44730
OpenCTI: Privilege escalation via graphQL API abusable by or - CVE-2026-27960
OpenCTI privilege escalation and unauthenticated access via - CVE-2026-39980
OpenCTI affected by RCE via notifier template
Same vendor: OpenCTI-Platform
- CVE-2026-35211
OpenCTI: Elasticsearch Painless Script Injection via GraphQL - CVE-2026-35212
OpenCTI has XSS in the rendering of email-message observable - CVE-2026-44730
OpenCTI: Privilege escalation via graphQL API abusable by or - CVE-2026-27960
OpenCTI privilege escalation and unauthenticated access via - CVE-2026-39980
OpenCTI affected by RCE via notifier template
Same weakness: CWE-639
- CVE-2026-41878
Insecure Direct Object Reference in R-SOFT DMS - CVE-2026-12400
FlowForms <= 1.1.1 - Authenticated (Contributor+) Insecure D - CVE-2026-6802
Easy Upload Files During Checkout <= 3.0.1 - Missing Authori - CVE-2026-55604
@arikusi/deepseek-mcp-server has an Authorization Bypass Thr - CVE-2026-59215
Open WebUI: Private channel messages can be disclosed throug
V. Comments for CVE-2026-35210
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