Open Redirection Bypass
This bypass I found in a application while I doing pentesting. I hope it will helps you too!
While you I trying to redirect https://targetweb.com?url=http://attackersite.com it did not redirected!
I Created a new subdomain with with www.targetweb.com.attackersite.com
And when I tried to redirect with https://targetweb.com?url=www.targetweb.com.attackersite.com
It will successfully redirected to the www.targetweb.com.attackersite.com website!
Due to the bad regex it has been successfully bypass their protection!
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