security/MemberLoginForm.php in SilverStripe 3.0.3 supports credentials in a GET request, which allows remote or local attackers to obtain sensitive information by reading web-server access logs, web-server Referer logs, or the browser history, a similar vulnerability to CVE-2013-2653.
Exposure of Sensitive Information to an Unauthorized Actor The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.