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CVE-2026-21887 (GCVE-0-2026-21887)

Vulnerability from cvelistv5 – Published: 2026-03-12 17:00 – Updated: 2026-03-12 17:52

Title

OpenCTI has a Semi-Blind SSRF via Unvalidated External URL in Data Ingestion Feature

Summary

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.

Severity

7.7 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CWE

CWE-918 - Server-Side Request Forgery (SSRF)

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/OpenCTI-Platform/opencti/secur…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
OpenCTI-Platform	opencti	Affected: < 6.8.16

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-21887",
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                "role": "CISA Coordinator",
                "timestamp": "2026-03-12T17:51:53.670909Z",
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            "attackComplexity": "LOW",
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PYSEC-2026-118

Vulnerability from pysec - Published: 2026-03-12 17:16 - Updated: 2026-05-20 09:19

Details

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.