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HTML entities that create ASCII characters inside a JavaScript URL

Chrome logo 50
Firefox logo 50
Edge logo 50
Safari logo 50

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

hackvertor
Created byhackvertor
Created Jun 25, 2024
Updated May 28, 2025

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Detecting browser...
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(/^.+?:/,''))

Fuzz results

Chrome logo
Chrome 145.0.0.0 desktop Windows NT 10.0
Updated16 Feb 2026
Found 50 results
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Chrome logo
Chrome 144.0.0.0 desktop macOS 10.15.7older version
Updated30 Jan 2026
Found 50 results
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Firefox logo
Firefox 147.0 desktop Windows NT 10.0
Updated29 Jan 2026
Found 50 results
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Firefox logo
Firefox 127.0 desktop macOS 10.15older version
Updated26 Jun 2024
Found 50 results
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Edge logo
Microsoft Edge 144.0.0.0 desktop Windows NT 10.0
Updated30 Jan 2026
Found 50 results
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Safari logo
Safari 17.4 desktop macOS 10.15.7
Updated26 Jun 2024
Found 50 results
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