High
OpenCTI: Synchronizer SSRF: stream fetch has no URL validation
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-76820
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 03:52 UTC · Revision 1
Source evidence
OpenCTI: Synchronizer SSRF: stream fetch has no URL validation
core-osv · Original sourcePublished 15 Sept 2026, 19:40 UTC
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.
osv:CVE-2026-76820
Complete source record
{
"id": "521233d81ee55a5587e9e98392b4509cf36dba3005745525c12b36ceb81cd819",
"url": "https://osv.dev/vulnerability/CVE-2026-76820",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "OpenCTI: Synchronizer SSRF: stream fetch has no URL validation",
"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 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.",
"evidence": "osv:CVE-2026-76820",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-76820",
"aliases": [
"CVE-2026-76820",
"GHSA-f6pj-3m32-q934"
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"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
}
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"modified": "2026-10-28T02:30:42.179199726Z",
"provider": "osv",
"references": [
"https://github.com/OpenCTI-Platform/opencti/releases/tag/7.260701.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76820.json",
"https://github.com/OpenCTI-Platform/opencti/security/advisories/GHSA-f6pj-3m32-q934",
"https://nvd.nist.gov/vuln/detail/CVE-2026-76820",
"https://github.com/OpenCTI-Platform/opencti/commit/6c1114ce8ce8f3a9d9b8c82dfff3a3a462e5dc1f",
"https://github.com/OpenCTI-Platform/opencti/pull/16617"
],
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],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76820.json"
}
},
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"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 509994,
"published_at": "2026-09-15T19:40:39.727+00:00"
}