The Easy Accept Payments for PayPal WordPress plugin before 4.9.10 does not validate and escape some of its shortcode attributes before outputting them back in a page/post where the shortcode is embed, which could allow users with the contributor role and above to perform Stored Cross-Site Scripting attacks.
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https://wpscan.com/vulnerability/aab5d803-d621-4b12-a901-ff4447334d88 | third party advisory vdb entry exploit technical description |