Characters allowed between slashes using XSS type

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 Jan 16, 2025

Updated May 27, 2025

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CategoryURL Handling

VisibilityPublic

TypeXSS

CharsetUTF-8

Code used before fuzz:

<script>window.onerror=x=>true;</script>0x0D
<base href="https://example.com" />

Template used:

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

Code used after fuzz:

x.host === "example2.com" && log($[i])

Sample payloads

<a href="/0x09/example2.com" id=x></a>

<a href="/
/example2.com" id=x></a>

<a href="/0x0D/example2.com" id=x></a>

<a href="///example2.com" id=x></a>

<a href="/\/example2.com" id=x></a>