MediaWiki before 1.9.2 allows remote attackers to obtain sensitive information via a direct request to (1) Simple.deps.php, (2) MonoBook.deps.php, (3) MySkin.deps.php, or (4) Chick.deps.php in wiki/skins, which shows the installation path in the resulting error message.
https://exchange.xforce.ibmcloud.com/vulnerabilities/32440
http://www.securityfocus.com/archive/1/459793/100/0/threaded
http://svn.wikimedia.org/viewvc/mediawiki?view=rev&revision=19681