What’s Vulnerable › Vulnerabilities
CVE-2026-21887: OpenCTI has a Semi-Blind SSRF via Unvalidated External URL in Data Ingestion Feature
- Severity: high (CVSS 7.7 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-03-12 · updated 2026-06-17
- Weakness: CWE-918
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.
Affected products
- OpenCTI-Platform opencti: before 6.8.16 — fixed in 6.8.16
How to fix
Upgrade to a fixed version: OpenCTI-Platform opencti 6.8.16. Check the vendor advisory for mitigations.
References
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