Cyber Risks · PortSwigger Research

XSS Validator

Summary: The XSS Validator is a Burp Suite extension that sends base64-encoded page responses to a locally running XSS-Detector server built on Phantom.js and/or Slimer.js, which listens by default on port 8093. Users copy the extension's Grep Phrase into Burp Intruder's grep-match function, and payloads matching that phrase indicate successful XSS execution; version 1.3.2a was last updated 10 February 2022 and requires Java 7.

Bottom line: The extension carries an overall system impact rating of High, and PortSwigger states it is written by a third-party user and makes no warranty about its quality or usefulness - so the tool that confirms your XSS findings is itself unaudited code running against your scan traffic.

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Topics
Vulnerabilities & Patching
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