Thread:Project:Support desk/MediaWiki Login via URL - POST method/reply (3)

From includes/api/ApiLogin.php:

You could change that to  and your link still would not work; you would just get an error code of. This is where you need to consider whether you really want to open up your wiki to login CSRF attacks, by commenting out the lines in includes/specials/SpecialUserlogin.php for checking the login token.

Depending on what exactly you are trying to accomplish, there might be a better way. Though without further information, I can't say what that would be.