{"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":0.00304,"epssPercentile":0.2337,"slug":"CVE-2026-76820","body":"## Overview\n\nOpenCTI 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}