行者路上有風有雨有彩虹

Bypass Google Open Redirect Filter Based on Google

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Bypass Google Open Redirect Filter Based on Googleads.g.doubleclick.net

However, if the URLs in a redirected domain have open URL redirection
vulnerabilities themselves, a user could be redirected from Google to a
vulnerable URL in that domain first and later be redirected from this
vulnerable site to a malicious site. This is as if being redirected from
Google directly.

https://seclists.org/fulldisclosure/2014/Nov/37