The WP Popup Builder Popup Forms and Marketing Lead Generation plugin is widely used in WordPress sites for creating customizable popups and lead capture forms. Marketers and site administrators utilize this tool to generate leads, increase engagement, and enhance user interactivity. It is particularly popular for its easy-to-integrate marketing functionalities and wide range of customizable templates. With its flexible settings, users can adapt popup designs to match brand themes and goals. The plugin is supported by ThemeHunk and is actively updated to meet modern marketing needs.
This vulnerability allows attackers to inject and execute arbitrary shortcodes on WordPress sites running the WP Popup Builder plugin. Due to improper validation in the wp_ajax_nopriv_shortcode_Api_Add AJAX action, unauthenticated users can abuse the do_shortcode functionality to insert unwanted code. This exploit compromises the security of the site, potentially revealing sensitive information or enabling unauthorized actions. The severity level is high, making it crucial for affected sites to take preventive measures immediately.
The vulnerability stems from a flaw in the wp_ajax_nopriv_shortcode_Api_Add AJAX action, which lacks adequate validation for user input. This allows unauthenticated attackers to send specially crafted POST requests that trigger the do_shortcode function, thereby executing arbitrary code. The specific endpoint affected is /wp-admin/admin-ajax.php with a payload action of shortcode_Api_Add. The vulnerability is present due to the insufficient handling of the shortcode input, making it susceptible to code injection. Successful exploitation results in the site executing arbitrary shortcodes, potentially allowing further attacks.
Exploitation of this vulnerability could lead to severe security risks, including unauthorized access to sensitive site areas, manipulation of site content, or data disclosure. Additionally, attackers could use this vulnerability to implant backdoors, create unwanted popups or redirects, or inject malicious content. Such compromises may impact site credibility, result in data breaches, and lead to SEO penalties if malicious code is embedded on the website.
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References:
- Update the WP Popup Builder Popup Forms and Marketing Lead Generation plugin to the latest version to mitigate the vulnerability.
- Limit access to the
/wp-admin/admin-ajax.phpendpoint to authorized users only. - Regularly review and apply security patches to WordPress plugins and core files.
- Implement server-side validation checks for user inputs, especially those using AJAX actions.
- Utilize a security plugin to monitor and block suspicious AJAX requests.
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