SilverStripe 2.3.x before 2.3.8 and 2.4.x before 2.4.1, when running on servers with certain configurations, allows remote attackers to obtain sensitive information via a direct request to PHP files in the (1) sapphire, (2) cms, or (3) mysite folders, which reveals the installation path in an error message.
http://www.openwall.com/lists/oss-security/2012/05/01/3
http://www.openwall.com/lists/oss-security/2012/04/30/3
http://www.openwall.com/lists/oss-security/2012/04/30/1
http://doc.silverstripe.org/sapphire/en/trunk/changelogs//2.4.1
http://doc.silverstripe.org/sapphire/en/trunk/changelogs//2.3.8