Arbitrary Shortcode Execution in WPForms Lite Plugin

Executive Summary

This vulnerability affects the WPForms Lite WordPress plugin versions 1.5.0.1 to 2.0.2. It allows unauthenticated users to execute arbitrary shortcodes by submitting form fields that include shortcode delimiters. When the form data is repopulated, the plugin fails to remove these delimiters, enabling attackers to inject malicious shortcodes and access non-public post attachments.

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Detection Guidance

Check if your WPForms Lite plugin version is between 1.5.0.1 and 2.0.2. Use WordPress admin to inspect the plugin version or run a command like 'wp plugin list --name=wpforms-lite' if using WP-CLI. Look for unexpected shortcode execution in form submissions or rendered output.

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Impact Analysis

An attacker could exploit this to read sensitive data like attachments from non-public posts. They might also execute unintended shortcodes, potentially leading to unauthorized actions or further compromise of the WordPress site.

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Compliance Impact

This vulnerability could lead to unauthorized access to personal or sensitive data, violating GDPR and HIPAA requirements for data protection and confidentiality. Organizations using affected versions may face compliance violations and legal consequences.

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Mitigation Strategies

Update WPForms Lite to version 2.0.2.1 or later immediately. If updating is not possible, disable the plugin temporarily until the update is applied. Review form submissions for suspicious shortcode usage and restrict access to sensitive data.

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