I would like to note that imho this edit is obfuscating the issue for a lot of wikis in a way. The rationale for my edit: I guess ConfirmAccount and Lockdown are installed on approximately 6000+ wikis and that is why I explicitly mentioned them. Wikis using either one of them on MW 1.27 are effectively broken at the moment. But yes, let's leave it like this since interested admins have now the chance to look at this post and peep at the issues I mentioned: ConfirmAccount (T137843) and Lockdown (T137051).
