tl;dr
New OpenID extension version 3.30 20130505
https://www.mediawiki.org/wiki/Extension:OpenID
A new version "3.30 20130505" has been published today.
It's a security fix and fixes some CSRF and XSS vulnerabilities.
The new version is strongly recommended.
Has been tested and works with latest MediaWiki including 1.22alpha
and also PHP versions including the 5.5.0beta versions.
If you find bugs, please file them directly in our bug tracker
https://bugzilla.wikimedia.org/enter_bug.cgi?product=MediaWiki%20extensions…
Thomas