The OpenPGP Form Encryption for WordPress plugin before 1.5.1 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.
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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https://wpscan.com/vulnerability/4e38c7d9-5b6a-4dfc-8f22-3ff30565ce43/ | third party advisory vdb entry exploit technical description |