Opera Software has released Opera 12.02 for Mac and Opera 11.67 (Mac App Store only release) with a recommended upgrade offering security and stability enhancements. The upgrade fixes a low severity security issue where truncated dialogs may be used to mislead or trick users into performing unwanted actions.
When an important dialog is being displayed, such as a download dialog, the entire dialog should be visible, so that the user can clearly see what the dialog’s buttons will do. In some cases, specific user interactions can cause Opera not to enforce this correctly, allowing the window to become smaller than the dialog. The edge of the window remains visible, but users may assume misleading buttons on an underlying page are part of the dialog buttons, and click on the part of the dialog’s buttons that are still visible. This can be used to cause the user to download and run executables unexpectedly, or perform other unwanted actions.
Opera users can update their browsers using the program’s built-in auto updater, or download version 12.02 for Mac OS X here.