Characters allowed javascript and colon copy2

Vector to check if any characters are allowed between javascript and : to still result in a javascript url.

Novice Fuzzer

Created Sep 29, 2024

Updated May 28, 2025

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CategoryURL Handling

VisibilityPublic

TypeJS

CharsetUTF-8

Template used:

if (new URL("javascript"+String.fromCodePoint(parseInt($[i]..toString(16),16))+":alert()").protocol=="javascript:"){log($[i])}

Sample payloads

if (new URL("javascript"+String.fromCodePoint(parseInt(9..toString(16),16))+":alert()").protocol=="javascript:"){alert(9)}

if (new URL("javascript"+String.fromCodePoint(parseInt(10..toString(16),16))+":alert()").protocol=="javascript:"){alert(10)}

if (new URL("javascript"+String.fromCodePoint(parseInt(13..toString(16),16))+":alert()").protocol=="javascript:"){alert(13)}

if (new URL("javascript"+String.fromCodePoint(parseInt(58..toString(16),16))+":alert()").protocol=="javascript:"){alert(58)}