CVE-2025-66116 is a vulnerability identified in the UserElements Ultimate Member Widgets for Elementor plugin, specifically affecting versions up to 2.3. The issue allows an attacker to retrieve sensitive information embedded within data sent by the plugin, without requiring any authentication or user interaction. This vulnerability arises from improper handling or insertion of sensitive data into outgoing data streams, which can be intercepted or accessed remotely. The CVSS score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) reflects that the attack vector is network-based, with low attack complexity, no privileges required, and no user interaction needed. The impact is primarily on confidentiality, as sensitive information can be exposed, but the integrity and availability of the system remain unaffected. The vulnerability is present in a widely used WordPress plugin that integrates with Elementor, a popular page builder, making it a significant concern for websites relying on these tools for user management and content presentation. No public exploits have been reported yet, but the ease of exploitation and the sensitivity of the data involved make it a critical issue to address promptly. The vulnerability was reserved in November 2025 and published in December 2025, indicating recent discovery and disclosure. The lack of available patches at the time of reporting necessitates immediate attention to alternative mitigation strategies.

For European organizations, this vulnerability poses a substantial risk to the confidentiality of sensitive user or organizational data managed through websites using the Ultimate Member Widgets for Elementor plugin. Exposure of such data could lead to privacy violations, regulatory non-compliance (e.g., GDPR), reputational damage, and potential legal consequences. Organizations in sectors such as finance, healthcare, e-commerce, and public services, which often handle sensitive personal data, are particularly vulnerable. The fact that exploitation requires no authentication or user interaction increases the risk of automated or opportunistic attacks. Additionally, given the widespread use of WordPress and Elementor in Europe, many SMEs and large enterprises could be affected. The vulnerability does not impact system integrity or availability directly, but the confidentiality breach alone can have cascading effects, including targeted phishing, identity theft, or further exploitation of exposed data. The absence of known exploits in the wild currently offers a window for proactive defense, but this may change rapidly once exploit code becomes available.

1. Monitor official UserElements and Elementor channels for patches addressing CVE-2025-66116 and apply updates immediately upon release. 2. Until a patch is available, consider disabling or removing the Ultimate Member Widgets for Elementor plugin if feasible, especially on high-risk or sensitive websites. 3. Implement strict access controls and network segmentation to limit exposure of web application data streams to untrusted networks. 4. Employ web application firewalls (WAFs) with custom rules to detect and block suspicious requests targeting the vulnerable plugin endpoints. 5. Conduct regular security audits and penetration tests focusing on data leakage vectors in WordPress environments. 6. Use monitoring tools to detect unusual outbound data patterns that may indicate exploitation attempts. 7. Educate web administrators and developers on secure plugin management and the risks of outdated components. 8. Review and minimize the amount of sensitive data processed or stored by the plugin to reduce potential exposure. 9. Consider implementing Content Security Policy (CSP) and other browser security headers to mitigate data exfiltration risks. 10. Maintain comprehensive backups and incident response plans to quickly recover from any potential compromise.