Author: bugs
Description:
If the "feed" parameter is anything other than "rss" or "atom", MediaWiki crashes because it tries to create an instance of an invalid class (includes/ChangesFeed.php, line 16). See URL for a live example right now in the live Wikipedia.
It should instead detect that the feed format is not valid and give an HTTP 500 error.
Version: 1.14.x
Severity: major
URL: http://en.wikipedia.org/w/index.php?title=Special:RecentChanges&feed=x