The changelog for the latest version of WooCommerce Address Book is “Security: Updated all save calls to do nonce verification checks.”. Looking at the changes made in that version we found that three AJAX accessible functions had nonce checks added to prevent cross-site request forgery (CSRF).

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This post provides insights on a vulnerability in the WordPress plugin WooCommerce Address Book not discovered by us, where the discoverer hadn't provided the details needed for us to confirm the vulnerability while we were adding it to the data set for our service, so the rest of its contents are limited to subscribers of our service.

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