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The Redux Framework plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 4.5.15 via the multi_media field. This is due to the field's renderer printing the stored value into an href attribute, a hidden input value and an HTML element without escaping, while every neighbouring attribute in the same method is wrapped in esc_attr(). It is compounded by Redux_Extension_Users::user_meta_save() evaluating a field's 'permissions' requirement against a user id taken from the request body ('checkuser_id') rather than the current user, so a Subscriber can write a field declared for 'manage_options'. This makes it possible for authenticated attackers with Subscriber-level access and above to inject arbitrary web scripts into their own profile record that execute when an administrator views that user's profile in the dashboard. Requires a theme or plugin that registers a multi_media field through the Redux Users API.

• https://www.wordfence.com/threat-intel/vulnerabilities/id/a4d54e48-3a7f-4add-b842-6948377f2a73?source=cve
• https://plugins.trac.wordpress.org/browser/redux-framework/tags/4.5.15/redux-core/inc/extensions/multi_media/multi_media/class-redux-multi-media.php#L110
• https://plugins.trac.wordpress.org/browser/redux-framework/tags/4.5.15/redux-core/inc/extensions/multi_media/multi_media/class-redux-multi-media.php#L147
• https://plugins.trac.wordpress.org/browser/redux-framework/tags/4.5.15/redux-core/inc/extensions/users/class-redux-extension-users.php#L1010
• https://plugins.trac.wordpress.org/browser/redux-framework/tags/4.5.15/redux-core/inc/extensions/users/class-redux-extension-users.php#L996
• https://plugins.trac.wordpress.org/changeset?reponame=&new=3741037%40redux-framework%2Ftags%2F4.5.16&old=3705066%40redux-framework%2Ftags%2F4.5.15
• https://plugins.trac.wordpress.org/changeset/3741037/redux-framework/trunk/redux-core/inc/extensions/multi_media/multi_media/class-redux-multi-media.php