WebKit before r52784, as used in Google Chrome before 4.0.249.78 and Apple Safari before 4.0.5, permits cross-origin loading of CSS stylesheets even when the stylesheet download has an incorrect MIME type and the stylesheet document is malformed, which allows remote attackers to obtain sensitive information via a crafted document.
http://www.vupen.com/english/advisories/2011/0552
http://www.vupen.com/english/advisories/2011/0212
http://www.vupen.com/english/advisories/2010/2722
http://www.ubuntu.com/usn/USN-1006-1
http://www.mandriva.com/security/advisories?name=MDVSA-2011:039
http://websec.sv.cmu.edu/css/css.pdf
http://sites.google.com/a/chromium.org/dev/Home/chromium-security/chromium-security-bugs
http://securitytracker.com/id?1023506
http://scarybeastsecurity.blogspot.com/2009/12/generic-cross-browser-cross-domain.html
http://lists.opensuse.org/opensuse-security-announce/2011-01/msg00006.html
http://googlechromereleases.blogspot.com/2010/01/stable-channel-update_25.html