A report by JPCERT/CC credits the discovery of a cross-site request forgery (CSRF) vulnerability in WP Ultra simple Paypal Cart to Mike Castro Demaria. The changelog for the version it appears that should be fixed in indicates something a bit different:

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This post provides insights on a vulnerability in the WordPress plugin WP Ultra simple Paypal Cart 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.

If you were using our service, you would have already been warned about this vulnerability if your website is vulnerable due to it. You can try out our service for free and then see the rest of the details of the vulnerability.

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