CVE-2025-66167 identifies a Missing Authorization vulnerability in the merkulove Lottier plugin, specifically within the lottier-gutenberg component, affecting all versions up to and including 1.1.1. The vulnerability arises from improperly configured access control mechanisms, which fail to enforce authorization checks correctly. This misconfiguration allows attackers to bypass security controls and perform unauthorized actions or access restricted resources within the plugin's scope. Since Lottier is a WordPress plugin used to embed and manage animations, the vulnerability could be exploited by unauthenticated or low-privileged users to manipulate content or potentially escalate privileges within the WordPress environment. The lack of a CVSS score and absence of known exploits in the wild suggest this is a newly disclosed issue. However, the impact on confidentiality and integrity is significant because unauthorized access can lead to data exposure or unauthorized content modification. The vulnerability does not require user interaction but depends on the presence of the vulnerable plugin version on the target system. No official patches or mitigation links are currently published, indicating that organizations must monitor vendor communications closely. The vulnerability is assigned by Patchstack and was reserved in late November 2025, with publication in mid-December 2025, indicating recent discovery and disclosure.

For European organizations, the impact of CVE-2025-66167 can be substantial, particularly for those relying on WordPress websites that utilize the merkulove Lottier plugin for animation content. Unauthorized access due to missing authorization checks can lead to content tampering, defacement, or injection of malicious scripts, potentially damaging brand reputation and user trust. Confidential data managed or displayed via the plugin could be exposed or altered, compromising data integrity. Additionally, attackers might leverage this vulnerability as a foothold to escalate privileges or move laterally within the network, increasing the risk of broader compromise. The absence of authentication requirements lowers the barrier to exploitation, making it easier for attackers to target vulnerable systems. Given the widespread use of WordPress in Europe, especially among SMEs and digital agencies, the vulnerability poses a risk to a broad range of sectors including e-commerce, media, and public services. The lack of known exploits currently provides a window for proactive mitigation, but the risk of future exploitation remains high.

European organizations should immediately inventory their WordPress environments to identify installations of the merkulove Lottier plugin, particularly versions up to 1.1.1. Until an official patch is released, organizations should consider disabling or removing the plugin if it is not essential. For environments where the plugin is critical, implement strict access controls at the web server and application levels, including IP whitelisting and role-based access restrictions to limit exposure. Monitor web server and application logs for unusual access patterns or attempts to exploit the plugin. Employ Web Application Firewalls (WAFs) with custom rules to detect and block unauthorized requests targeting the vulnerable plugin endpoints. Stay updated with vendor advisories and apply patches promptly once available. Conduct security assessments and penetration testing focused on WordPress plugins to identify similar misconfigurations. Educate website administrators on secure plugin management and the importance of timely updates. Finally, implement comprehensive backup and recovery procedures to mitigate the impact of potential exploitation.