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CVE-2026-21887 is a server-side request forgery vulnerability in OpenCTI prior to version 6.8.16. The issue affects the platform’s data ingestion feature, which accepts user-supplied URLs without validating the destination and fetches them using the Axios HTTP client with its default behavior permitting absolute URLs. As a result, an authenticated attacker with access to ingestion configuration can cause the OpenCTI server to issue requests to arbitrary endpoints, including localhost, private-network services, and link-local addresses such as cloud metadata endpoints. The vulnerability is described as semi-blind because full response contents may not always be exposed to the attacker, but the attacker can still trigger requests and interact with reachable internal services. Supporting context indicates the vulnerable implementation performed axios.get on attacker-controlled URLs without destination validation, while the fix added hostname resolution and blocking of private and link-local IP ranges.
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Cross-references every affected SKU, including bundled OEM variants.
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