[HeXagone]

you got the hash using Sqli i don't know if it is still working but here is what you have to do :
get the email of the admin
go to wp-login.pph page and click on forgot password
enter the email and click on get new password
get the user_activation_key
wp-login.php?action=rp&key=resetkey&login=username
replace username and resetkey you got above.

hope it works
HeXagone

[Soulo]

you got the hash using Sqli i don't know if it is still working but here is what you have to do :
get the email of the admin
go to wp-login.pph page and click on forgot password
enter the email and click on get new password
get the user_activation_key
wp-login.php?action=rp&key=resetkey&login=username
replace username and resetkey you got above.

hope it works
HeXagone

This was patched in October of 2013...

https://core.trac.wordpress.org/changeset/25696