Open Redirect

When we visit,, we have some trust on that site. We know that it is not a malicious website or a not fake one.

for eg.,

If we see URL like We see the domain, and from that, we understood, its

But, what if this URL redirects to

If redirected, then this is Open Redirect Vulnerability on (Yes! This was an actual bug found on Facebook by @dwi.siswanto98 in Jan 2020)

Open Redirect Vulnerability can be classified as,

  1. GET-Based
  2. POST-Based
  3. Header-Based
  4. Flash-Based