Lab: Blind SSRF with out-of-band detection
Summary: PortSwigger's lab on blind SSRF with out-of-band detection uses a site whose analytics software fetches the URL in the Referer header when a product page loads. The exercise is to use that behavior to trigger an HTTP request to the public Burp Collaborator server, since the Academy firewall blocks interactions between labs and arbitrary external systems.
Why it matters: The detection channel here is out-of-band: the request never shows up in the application's own response, so a security team watching only inbound traffic and page output would miss an SSRF that fires through a Referer header.
Read the original at PortSwigger Research ↗
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