HTML entities that create ASCII characters inside a JavaScript URL

This vector loops through all entities and assigns them to a JavaScript URL and checks if they decode to ASCII characters.

Shazzer Elite

Created byhackvertor

Created Jun 25, 2024

Updated May 28, 2025

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CategoryEntity Parsing

VisibilityPublic

TypeJS

CharsetUTF-8

$[data1] placeholderhtml_entities

Code used before fuzz:

const div = document.createElement('div');

Template used:

div.innerHTML='<a href="javascript:$[data1]">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && log('$[data1]='+element.href.replace(/^.+?:/,''))

Sample payloads

div.innerHTML='<a href="javascript:&amp;=&">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&amp;=&='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&AMP;=&">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&AMP;=&='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&apos;='">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&apos;='='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&ast;=*">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&ast;=*='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&bne;==%E2%83%A5">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&bne;==%E2%83%A5='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&bsol;=\">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&bsol;=\='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&colon;=:">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&colon;=:='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&comma;=">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&comma;=='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&commat;=@">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&commat;=@='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&DiacriticalGrave;=`">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&DiacriticalGrave;=`='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&dollar;=$">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&dollar;=$='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&equals;==">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&equals;==='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&excl;=!">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&excl;=!='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&fjlig;=fj">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&fjlig;=fj='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&grave;=`">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&grave;=`='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&gt;=>">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&gt;=>='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&GT;=>">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&GT;=>='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&Hat;=^">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&Hat;=^='+element.href.replace(/^.+?:/,''))

div.innerHTML='<a href="javascript:&lbrace;={">test</a>';0x0D
let element = div.querySelector('a');0x0D
(element.href==="javascript:"|/:.*[\x00-\x7f]/.test(element.href)) &&  !/^javascript:(%[a-fA-F0-9]{2})+$/.test(element.href) && alert('&lbrace;={='+element.href.replace(/^.+?:/,''))

Distributed Fuzzing

HTML entities that create ASCII characters inside a JavaScript URL

Sample payloads

Fuzz results