Small windows can be used in several ways to trick users into executing downloads – Opera Security Advisories

When the download dialog is displayed, it should always be visible to the user, to ensure that the user realizes it is there. If the dialog is displayed in a small enough window, the user may not realize it is being displayed, and if the right keyboard sequence is carefully followed, they can end...

CVE-2012-3555

CVE-2012-3555 affects Opera before 11.65, where keyboard sequences may not be tied to a visible window, enabling user‑assisted remote attackers to perform cross‑site scripting or execute arbitrary code via a crafted page (hidden keyboard navigation). The OpenVAS and vendor notes corroborate Opera...

vim: arbitrary code execution in commands: K, Control-], g]

Vim 3.0 through 7.x before 7.2.010 does not properly escape characters, which allows user-assisted attackers to 1 execute arbitrary shell commands by entering a K keystroke on a line that contains a ";" semicolon followed by a command, or execute arbitrary Ex commands by entering an argument afte...