The MediaElementAudioSourceNode::process function in modules/webaudio/MediaElementAudioSourceNode.cpp in the Web Audio API implementation in Blink, as used in Google Chrome before 42.0.2311.90, allows remote attackers to bypass the Same Origin Policy and obtain sensitive audio sample values via a crafted web site containing a media element.
Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.