Language: JavaScript
Label: vulnerable
CWE: CWE-79 \u2014 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Code:
    function destroy() {
        if (KB.exists('#screenshot-pastezone')) {
            KB.find('#screenshot-pastezone').remove();
        }

        document.removeEventListener('click', setFocus);
        pasteCatcher = null;
    }