- Submit a random alphanumeric string in the search box, then use Burp Suite to intercept the search request and send it to Burp Repeater.
- Observe that the random string has been reflected inside a JavaScript string.
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Try sending the payload
test'payloadand observe that your single quote gets backslash-escaped, preventing you from breaking out of the string. -
Try sending the payload
test\payloadand observe that your backslash doesn't get escaped. -
Replace your input with the following payload to break out of the JavaScript string and inject an alert:
\'-alert(1)// - Verify the technique worked by right clicking, selecting "Copy URL", and pasting the URL in the browser. When you load the page it should trigger an alert.
Lab: Reflected XSS into a JavaScript string with angle brackets and double quotes HTML-encoded and single quotes escaped
This lab contains a reflected cross-site scripting vulnerability in the search query tracking functionality where angle brackets and double are HTML encoded and single quotes are escaped.
To solve this lab, perform a cross-site scripting attack that breaks out of the JavaScript string and calls the alert function.
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