Advisory: Opera may be used as a vector for a font issue 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. On unpatched systems, Web fonts may be used to exploit this issue through Opera.
For complete protection, users should apply the patch provided by Microsoft. Opera Software has also released Opera 10.54, which prevents Opera from being used to exploit this issue on unpatched systems.
Thanks to Microsoft's security team for reporting this issue to Opera Software.