Burp Repeater is a simple tool for manually manipulating and reissuing individual HTTP requests, and analyzing the application's responses. You can send a request to Repeater from anywhere within Burp, modify the request and issue it over and over.
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This release adds a new scan check for external service interaction and out-of-band resource load via injected XML doctype tags containing entity parameters.
Burp Scanner now modifies XML in requests to inject a doctype tag that defines an XML entity parameter that references a Burp Collaborator URL, and reports an appropriate issue based on any observed interactions (DNS or HTTP) that reach the Burp Collaborator server.