CVE-2025-66116 identifies a vulnerability in the UserElements Ultimate Member Widgets for Elementor plugin, specifically versions up to 2.3, where sensitive information can be improperly inserted into data sent by the plugin. This vulnerability allows attackers to retrieve embedded sensitive data that should otherwise be protected. The root cause is related to the plugin's handling of data transmission, where sensitive information is exposed due to insufficient sanitization or validation before sending. This can lead to confidentiality breaches, as attackers may intercept or access data not intended for them. The vulnerability does not require user interaction or authentication, increasing its risk profile. Although no public exploits have been reported yet, the presence of this flaw in a widely used WordPress plugin component that integrates with Elementor—a popular page builder—raises concerns for websites relying on these tools for user management and content display. The lack of a CVSS score indicates the need for a severity assessment based on impact and exploitability factors. The vulnerability affects the integrity and confidentiality of data, with potential consequences including data leakage of user information or other sensitive content embedded in the widget's data. The plugin is commonly used in membership and user profile management scenarios, making the exposure of sensitive data particularly critical. The vulnerability was published in December 2025, with no patch links currently available, suggesting that users should monitor vendor communications closely for updates. The issue is tracked by Patchstack, a known assigner for WordPress-related vulnerabilities.

For European organizations, this vulnerability poses a significant risk to the confidentiality of sensitive user data managed through WordPress sites using the Ultimate Member Widgets for Elementor plugin. Exposure of embedded sensitive information could lead to data breaches, regulatory non-compliance (e.g., GDPR violations), reputational damage, and potential financial penalties. Organizations in sectors such as finance, healthcare, education, and e-commerce, which often use membership or user profile management plugins, are particularly vulnerable. The ease of exploitation without authentication or user interaction increases the threat level, potentially allowing remote attackers or malicious insiders to access sensitive data. This could facilitate further attacks such as identity theft, phishing, or targeted social engineering. Additionally, the vulnerability might undermine trust in web platforms and complicate compliance with European data protection laws. The absence of known exploits currently provides a window for proactive mitigation, but the risk remains high given the plugin's widespread use.

Organizations should immediately inventory their WordPress installations to identify the use of Ultimate Member Widgets for Elementor plugin, particularly versions up to 2.3. Until an official patch is released, administrators should consider disabling or removing the affected plugin components to prevent data leakage. Implement strict access controls and monitoring on web servers hosting the plugin to detect unusual data transmissions or unauthorized access attempts. Employ web application firewalls (WAFs) with custom rules to block suspicious requests targeting the plugin endpoints. Review and minimize the amount of sensitive data embedded or transmitted through the plugin's widgets. Regularly audit user permissions and plugin configurations to ensure least privilege principles are enforced. Stay informed through vendor channels and security advisories for timely patch deployment once available. Additionally, conduct penetration testing focused on data leakage vectors related to this plugin to identify and remediate exposure risks. Backup website data securely and prepare incident response plans in case of exploitation.