The XSSAuditor::init function in core/html/parser/XSSAuditor.cpp in the XSS auditor in Blink, as used in Google Chrome before 33.0.1750.117, processes POST requests by using the body of a redirecting page instead of the body of a redirect target, which allows remote attackers to obtain sensitive information via unspecified vectors.
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.