Advisory: Insecure pages can show incorrect security information
When insecure pages load content from secure sites into a frame, they can cause Opera to incorrectly report the insecure site as being secure. The padlock icon will incorrectly be shown, and the security information dialog will state that the connection is secure, but without any certificate information.
Opera Software has released Opera 9.52, where this issue has been fixed.
Thanks to Lars Kleinschmidt for reporting this issue to Opera Software.