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How to do it...

Navigate to the XML External Entity Injection page, that is, through Others | XML External Entity Injection | XML Validator:

While on the XML Validator page, perform the example XML that is provided on the page. Click on the Validate XML button:

Switch to Burp Proxy| HTTP history tab and look for the request you just submitted to validate the XML. Right-click and send the request to the repeater:

Note the value provided ...

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