Characters allowed after colon which result in an external URL

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This is an example how you can use the XSS type to fuzz URLs. It uses a base tag to get round the sandboxed iframe problems.

Created on: Thursday, January 16, 2025 at 6:56:19 PM

Updated on: Friday, March 21, 2025 at 12:35:28 PM

Vector type: XSS

Vector charset: UTF-8

Vector data 1: html_entities

<script>window.onerror=x=>true;</script>
<base href="https://example.com" />

<a href="https:$[chr]$[chr]example2.com" id=x></a>

x.protocol === 'https:' && x.host === "example2.com" && log($[i])