Example Collaborator-based check - Port Swigger
Summary: PortSwigger published a BCheck that lets Burp Scanner use Burp Collaborator to detect SSRF by sending a request with a Collaborator interaction ID in the Referer header. If the Collaborator server receives an HTTP interaction from that request, the check raises an issue at high severity with firm confidence, and it solves the Blind SSRF with out-of-band detection Web Security Academy lab outright.
Bottom line: Out-of-band SSRF leaves no visible response in the application, so a scanner that only reads replies will miss it; this check depends on the Collaborator server actually receiving an interaction, which is the only proof the request was executed server-side.
Read the original at PortSwigger Research ↗
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