---
id: CVE-2026-35210
title: >-
  OpenCTI is an open source platform for managing cyber threat intelligence
  knowledge and observables
summary: >-
  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 t…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N'
cwe:
  - CWE-639
  - CWE-863
vendor: citeum
product: opencti
affected:
  - opencti < 7.260326.0
patched:
  - opencti 7.260326.0
published: '2026-07-08'
updated: '2026-07-13'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-35210'
references:
  - url: >-
      https://github.com/OpenCTI-Platform/opencti/commit/134531ddf5ecf741006b7f0870b7c36711b96540
    label: security-advisories@github.com
  - url: 'https://github.com/OpenCTI-Platform/opencti/pull/14243'
    label: security-advisories@github.com
  - url: 'https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260326.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-36fr-4m54-94mj
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00353
epssPercentile: 0.26188
ingestedAt: '2026-07-13T15:27:34.340Z'
---

## Overview

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.

## Affected

- `opencti < 7.260326.0`

## Remediation

Upgrade past the affected range:

- `opencti 7.260326.0`