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CVE-2026-76820— OpenCTI: Synchronizer SSRF: stream fetch has no URL validation

Quick assessment

Affected
OpenCTI-Platform opencti
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenCTI 是一个用于管理网络威胁情报知识和可观察项的开源平台。在 7.260701.0 版本之前， GraphQL 查询在调用 时，仅检查远程流 URL 是否使用了 HTTP 或 HTTPS 协议。后端未应用数据摄入（ingestion）拒绝列表，也未拒绝指向私有地址、回环地址（loopback）和链路本地地址（link-local）的目标，使得拥有 INGESTION 权限的已认证账户能够促使 OpenCTI 向内部服务和云元数据端点发起请求。返回的连接错误能够区分开放的 HTTP 端口、开放的非 HTTP

CVSS 7.7 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenCTI-Platform opencti < 7.260701.0 affected
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I. Basic Information for CVE-2026-76820

Vulnerability Information
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Vulnerability Title
OpenCTI: Synchronizer SSRF: stream fetch has no URL validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenCTI-Platform opencti < 7.260701.0 -

II. Public POCs for CVE-2026-76820

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III. Intelligence Information for CVE-2026-76820

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Patches & Fixes for CVE-2026-76820 (2)

Vendor Advisories for CVE-2026-76820 (1)

Vendor Pages for CVE-2026-76820 (1)

IV. Related Vulnerabilities

Same product: opencti
Same vendor: OpenCTI-Platform
Same weakness: CWE-918

V. Comments for CVE-2026-76820

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