Opera before 12.13 does not send CORS preflight requests in all required cases, which allows remote attackers to bypass a CSRF protection mechanism via a crafted web site that triggers a CORS request.
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
Link | Tags |
---|---|
http://www.opera.com/docs/changelogs/unified/1213/ | |
http://lists.opensuse.org/opensuse-updates/2013-02/msg00038.html | vendor advisory |
http://www.opera.com/support/kb/view/1045/ | vendor advisory |