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The PayPlug for WooCommerce (Official) WordPress plugin before 3.1.1 does not perform any capability or ownership check on a set of unauthenticated AJAX actions that operate on a caller-supplied order identifier, allowing unauthenticated attackers to modify, read the contents of, and permanently delete arbitrary WooCommerce orders.
The PayPlug for WooCommerce (Official) WordPress plugin before 3.1.1 does not verify that the requester owns the WooCommerce order named in a payment request, allowing unauthenticated users to disclose another customer's order key and cancel their unpaid guest order.
Unauthenticated Settings Change in PayPlug for WooCommerce (Official) <= 3.1.0 versions.
Unauthenticated Broken Access Control in PayPlug for WooCommerce (Official) <= 3.1.0 versions.