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CVE-2026-21887— OpenCTI has a Semi-Blind SSRF via Unvalidated External URL in Data Ingestion Feature

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OpenCTI开源的一个开放网络威胁情报平台。 OpenCTI 6.8.16之前版本存在代码问题漏洞，该漏洞源于数据摄取功能未验证用户提供的URL，可能导致服务器端请求伪造攻击。

CVSS 7.7 · High EPSS 0.23% · P13
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I. Basic Information for CVE-2026-21887

Vulnerability Information
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Vulnerability Title
OpenCTI has a Semi-Blind SSRF via Unvalidated External URL in Data Ingestion Feature
Source: CVE Program / CVE List V5
Vulnerability Description
OpenCTI is an open source platform for managing cyber threat intelligence knowledge and observables. Prior to 6.8.16, the OpenCTI platform’s data ingestion feature accepts user-supplied URLs without validation and uses the Axios HTTP client with its default configuration (allowAbsoluteUrls: true). This allows attackers to craft requests to arbitrary endpoints, including internal services, because Axios will accept and process absolute URLs. This results in a semi-blind SSRF, as responses may not be fully visible but can still impact internal systems. This vulnerability is fixed in 6.8.16.
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
Vulnerability Title
OpenCTI 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenCTI是OpenCTI开源的一个开放网络威胁情报平台。 OpenCTI 6.8.16之前版本存在代码问题漏洞，该漏洞源于数据摄取功能未验证用户提供的URL，可能导致服务器端请求伪造攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenCTI-Platform opencti < 6.8.16 -

II. Public POCs for CVE-2026-21887

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III. Intelligence Information for CVE-2026-21887

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Vendor Advisories for CVE-2026-21887 (1)

IV. Related Vulnerabilities

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