OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection (CVE-2026-35210) | HOL Guard CVE

High · CVSS 7.1CVE-2026-35210

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

Answer in brief

CVE-2026-35210 records a High severity (CVSS 7.1) vulnerability in OpenCTI: Authorization Bypass via `synchronized-upsert` HTTP Header Injection. The current sources do not mark it as known exploited. The current feed maps OpenCTI-Platform/opencti (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Jul 8, 2026Updated Jul 13, 2026Source checked Sep 20, 2026First seen by HOL Jul 8, 2026Material review Jul 13, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 7.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps OpenCTI-Platform/opencti (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
OpenCTI-Platform/openctigeneric	< 7.260326.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for OpenCTI-Platform/opencti.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jul 13, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 8, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.