The Twenty20 Image Before-After WordPress plugin through 1.5.9 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/e54804c7-68a9-4c4c-94f9-1c3c9b97e8ca | exploit vdb entry third party advisory technical description |