The GenerateFunction function in bindings/scripts/code_generator_v8.pm in Blink, as used in Google Chrome before 33.0.1750.149, does not implement a certain cross-origin restriction for the EventTarget::dispatchEvent function, which allows remote attackers to conduct Universal XSS (UXSS) attacks via vectors involving events.
https://src.chromium.org/viewvc/blink?revision=166999&view=revision
https://code.google.com/p/chromium/issues/detail?id=342618
http://www.securitytracker.com/id/1029914
http://www.debian.org/security/2014/dsa-2883
http://security.gentoo.org/glsa/glsa-201408-16.xml
http://lists.opensuse.org/opensuse-security-announce/2014-04/msg00008.html
http://googlechromereleases.blogspot.com/2014/03/stable-channel-update_11.html