{"id":"CVE-2026-76820","state":"PUBLISHED","title":"OpenCTI: Synchronizer SSRF: stream fetch has no URL validation","description":"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.","publishedAt":"2026-09-15T19:40:39.727Z","updatedAt":"2026-09-16T19:23:48.304Z","severity":{"score":7.7,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["OpenCTI-Platform opencti"],"affected":[{"vendor":"OpenCTI-Platform","product":"opencti","versions":[{"version":"< 7.260701.0","status":"affected"}]}],"references":["https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-f6pj-3m32-q934","https://github.com/OpenCTI-Platform/opencti/pull/16617","https://github.com/OpenCTI-Platform/opencti/commit/6c1114ce8ce8f3a9d9b8c82dfff3a3a462e5dc1f","https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260701.0"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/76xxx/CVE-2026-76820.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-76820","state":"PUBLISHED","datePublished":"2026-09-15T19:40:39.727Z","dateUpdated":"2026-09-16T19:23:48.304Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-08-19T19:52:28.214Z"},"containers":{"cna":{"title":"OpenCTI: Synchronizer SSRF: stream fetch has no URL validation","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"OpenCTI-Platform","product":"opencti","versions":[{"version":"< 7.260701.0","status":"affected"}]}],"references":[{"url":"https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-f6pj-3m32-q934","name":"https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-f6pj-3m32-q934","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/OpenCTI-Platform/opencti/pull/16617","name":"https://github.com/OpenCTI-Platform/opencti/pull/16617","tags":["x_refsource_MISC"]},{"url":"https://github.com/OpenCTI-Platform/opencti/commit/6c1114ce8ce8f3a9d9b8c82dfff3a3a462e5dc1f","name":"https://github.com/OpenCTI-Platform/opencti/commit/6c1114ce8ce8f3a9d9b8c82dfff3a3a462e5dc1f","tags":["x_refsource_MISC"]},{"url":"https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260701.0","name":"https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260701.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","description":"CWE-918: Server-Side Request Forgery (SSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-15T19:40:39.727Z"},"source":{"advisory":"GHSA-f6pj-3m32-q934","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-16T19:21:38.656123Z","id":"CVE-2026-76820","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-16T19:23:48.304Z"}}]}}}