The Page & Post Notes plugin for WordPress is vulnerable to unauthorized modification of notes due to a missing capability check on the 'yydev_notes_save_dashboard_data' function in all versions up to, and including, 1.3.4. This makes it possible for authenticated attackers, with Subscriber-level access and above, to modify notes.
https://plugins.trac.wordpress.org/browser/page-post-notes/trunk/index.php#L85
https://plugins.trac.wordpress.org/browser/page-post-notes/trunk/include/insert-to-db.php