---
id: CVE-2026-76820
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 7.260701.0, the synchronizerFetch GraphQL
  query called fetchRemoteStreams after checking only that a remote stream URL
  used HTT…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-918
vendor: OpenCTI-Platform
product: opencti
affected:
  - opencti < 7.260701.0
published: '2026-09-15'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T20:17:28.957'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-76820'
references:
  - url: >-
      https://github.com/OpenCTI-Platform/opencti/commit/6c1114ce8ce8f3a9d9b8c82dfff3a3a462e5dc1f
    label: security-advisories@github.com
  - url: 'https://github.com/OpenCTI-Platform/opencti/pull/16617'
    label: security-advisories@github.com
  - url: 'https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260701.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-f6pj-3m32-q934
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-16T19:21:38.656123Z'
ingestedAt: '2026-09-15T20:44:02.417Z'
epss: 0.00415
epssPercentile: 0.33035
---

## Overview

OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 7.260701.0, the synchronizerFetch GraphQL query called fetchRemoteStreams after checking only that a remote stream URL used HTTP or HTTPS. The backend did not apply the ingestion deny list or reject private, loopback, and link-local destinations, allowing an authenticated account with the INGESTION capability to make OpenCTI request internal services and cloud metadata endpoints. Returned connection errors could distinguish open HTTP ports, open non-HTTP ports, and closed ports, enabling internal network scanning, while compatible endpoint responses could disclose internal data. This issue is fixed in version 7.260701.0.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.