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I am working on a web application where I have to tell user that he is logged in gmail or yahoo or facebook account. I think this can be done using cookies.
How to find out it?
what is the cookie name of these accounts, so that I can check their presence
Gmail can be tested by linking to a public image in your own google account. Facebook can be tested by loading your own profile, as a script. Both of these links will succeed if the person is logged into the respective service and fail if they are not. Afraid I don’t know specific details for Yahoo but I imagine a similar technique would work.
A good article on this is located here, I believe the techniques both still work:
https://grepular.com/Abusing_HTTP_Status_Codes_to_Expose_Private_Information