Advisory: Opera may be used as a vector for multiple font issues in the underlying operating system
This vulnerability may be targeted through Opera for Windows.
A flaw in the font handling on the Windows operating system has been fixed by Microsoft - see bulletins MS10-091 and MS10-063. On unpatched systems, Web fonts may be used to exploit this issue through Opera.
Opera urgently recommends that all Windows users apply the patches from Microsoft, and use fully patched Windows installations.
Thanks to Marc Schoenefeld of the Red Hat Security Response Team for reporting this issue to Opera Software. The fix for the issue was coordinated by Microsoft's Security Response Team.