This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of the WebKit library. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file.
The specific flaw exists when the library attempts to replace a particular element due to an HTML5 ContentEditable command. Due to the library not accommodating for DOM mutation events that can be made to occur, an aggressor can modify the tree out from underneath the library, leading to a type change. This can be used to trigger a use-after-free condition at which point can lead to code execution under the context of the application.