CVE-2025-66153 identifies a missing authorization vulnerability (CWE-862) in the merkulove Headinger plugin for Elementor, a WordPress page builder add-on. This vulnerability arises from improperly configured access control mechanisms that fail to verify whether a user has the necessary permissions before performing certain actions within the plugin. The flaw affects all versions up to 1.1.4, allowing an attacker with limited privileges (PR:L) to exploit the vulnerability remotely (AV:N) without requiring user interaction (UI:N). The impact primarily affects the integrity and availability of the affected system, as unauthorized users can potentially modify plugin settings or disrupt its functionality. The CVSS 3.1 vector (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L) indicates that exploitation is relatively easy due to low attack complexity and no user interaction, but it requires some level of privilege. No patches or known exploits are currently available, but the vulnerability is publicly disclosed and should be addressed promptly. Since Headinger is a plugin for Elementor, widely used in WordPress sites for building headers and page elements, the vulnerability could be leveraged to compromise website integrity or availability, impacting business operations and user trust.

For European organizations, this vulnerability poses a risk of unauthorized changes to website content or disruption of web services, potentially leading to reputational damage, loss of customer trust, and operational downtime. Organizations relying on WordPress with Elementor and the merkulove Headinger plugin for their web presence are particularly vulnerable. Attackers exploiting this flaw could alter website headers or other critical page elements, affecting the integrity of the site. Availability impacts could result from denial of service or plugin malfunction caused by unauthorized actions. While confidentiality is not directly impacted, the integrity and availability consequences could indirectly affect sensitive business processes and customer interactions. Given the medium severity and the requirement for some privilege, the threat is moderate but significant enough to warrant immediate attention in environments where the plugin is deployed.

Organizations should monitor for updates from merkulove and apply security patches for Headinger for Elementor as soon as they become available. Until patches are released, administrators should restrict plugin management permissions strictly to trusted users and review user roles to minimize privilege levels. Implementing web application firewalls (WAF) with rules targeting suspicious plugin-related requests can help detect and block exploitation attempts. Regular audits of WordPress user accounts and plugin configurations should be conducted to ensure no unauthorized changes occur. Additionally, maintaining regular backups of website data and configurations will aid in recovery if exploitation occurs. Security teams should also monitor logs for unusual activity related to the plugin and Elementor to detect early signs of exploitation.