The Gift Cards (Gift Vouchers and Packages) (WooCommerce Supported) plugin for WordPress is vulnerable to unauthorized modification of data|loss of data due to a missing capability check on the 'update_voucher_price', 'update_voucher_date', 'update_voucher_note' functions in all versions up to, and including, 4.4.6. This makes it possible for unauthenticated attackers to update the value, expiration date, and user note for any gift voucher.
https://plugins.trac.wordpress.org/browser/gift-voucher/trunk/include/edit-order-voucher.php#L56
https://plugins.trac.wordpress.org/browser/gift-voucher/trunk/include/edit-order-voucher.php#L5
https://plugins.trac.wordpress.org/browser/gift-voucher/trunk/include/edit-order-voucher.php#L30