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The Themify Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'variations' repeater field of Custom Font (tb_cf) posts in versions up to, and including, 7.8.4. This is due to insufficient input sanitization and output escaping on the variations post meta: Themify_Metabox::_save_meta() only passes the value through wp_kses_data() when the field type is 'textbox' or 'textarea', so the 'repeater' field writes attacker-controlled sub-fields (style, woff/woff2/ttf/svg/eot URLs) to update_post_meta() verbatim, and Themify_Custom_Fonts::render_columns() later echoes those values unescaped inside a <style> block on the Custom Fonts admin listing. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page (specifically, the Custom Fonts admin listing).

• https://www.wordfence.com/threat-intel/vulnerabilities/id/cf80f304-f79d-4863-b57a-d273daa5fe7f?source=cve
• https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.8.4/themify/class-themify-custom-fonts.php#L287
• https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.8.4/themify/themify-metabox/includes/themify-metabox-core.php#L208
• https://plugins.trac.wordpress.org/browser/themify-builder/tags/7.8.4/themify/themify-metabox/includes/themify-metabox-core.php#L230
• https://plugins.trac.wordpress.org/changeset?reponame=&old=3774070%40themify-builder&new=3774070%40themify-builder