23 Oct 2026 15:48:27 UTC
OpenCTI: Synchronizer SSRF: stream fetch has no URL validation
cve-program · CVE-2026-76820 · Published
CVE-2026-76820
OpenCTI: Synchronizer SSRF: stream fetch has no URL validation
CVSS 3.1 7.7 HIGHCheck source for fixed versionsKEV status unknown
cve-program · CVE-2026-76820
PublishedOpenCTI 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.
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