The YITH WooCommerce Gift Cards WordPress plugin through 4.39.0 does not reconcile the value of a gift card it issues against the amount actually paid for it, instead crediting the new card with the item's pre-discount price, which allows customers to apply an ordinary store coupon at checkout and receive a gift card worth more than they paid.

The YITH WooCommerce Gift Cards WordPress plugin before 4.38.1 does not lock or atomically update a gift card's balance when it is redeemed at checkout, allowing an attacker who holds a gift card code to spend more than its funded value by submitting multiple checkouts for the same code at the same time.

The YITH WooCommerce Gift Cards plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'savemailstatus' and 'saveemailsettings' functions in all versions up to, and including, 4.12.0. This makes it possible for unauthenticated attackers to modify WooCommerce settings.