Fix XSS issue in href attribute on area tag (#5240, #5241)

Aleksander Machniak

2016-05-06 acf633c73bc8df9a5036bc52d7568f4213ab73c7

 program/lib/Roundcube/html.php

@@ -153,7 +153,7 @@
            $attr = array('src' => $attr);
        }
        return self::tag('img', $attr + array('alt' => ''), null, array_merge(self::$common_attrib,
            array('src','alt','width','height','border','usemap','onclick')));
            array('src','alt','width','height','border','usemap','onclick','onerror')));
    }

    /**