CVE-2025-66167 identifies a missing authorization vulnerability in the merkulove Lottier plugin, specifically the lottier-gutenberg component, which is used to embed Lottie animations into WordPress Gutenberg blocks. The vulnerability arises from incorrectly configured access control security levels, allowing attackers with low privileges (PR:L) to perform unauthorized actions remotely (AV:N) without requiring user interaction (UI:N). The CVSS 3.1 base score of 5.4 reflects a medium severity, indicating limited but non-negligible impact on confidentiality and integrity, with no impact on availability. The vulnerability affects all versions up to and including 1.1.1, though the exact affected versions are unspecified (noted as 'n/a'). The flaw could enable an attacker to access or modify data or functionality that should be restricted, potentially leading to information disclosure or unauthorized content manipulation within the WordPress environment. No public exploits have been reported yet, but the vulnerability is published and should be addressed promptly. The root cause is a failure to enforce proper authorization checks in the plugin’s access control logic, which is critical for maintaining the security boundary between different user roles and capabilities within WordPress. Given the plugin’s role in rendering animations, exploitation could also affect the integrity of website content or user experience.

For European organizations, the impact of CVE-2025-66167 depends largely on their use of the merkulove Lottier plugin within WordPress environments. Organizations using this plugin to enhance their websites with Lottie animations may face risks of unauthorized access or modification of animation content or related data. This could lead to limited confidentiality breaches, such as exposure of sensitive configuration or content data, and integrity issues, including unauthorized content changes that might affect brand reputation or user trust. While availability is not impacted, the unauthorized actions could facilitate further attacks if combined with other vulnerabilities. Sectors with high reliance on web presence and digital marketing, such as e-commerce, media, and public services, may experience reputational damage or operational disruption. The medium severity score suggests the threat is moderate but should not be ignored, especially in environments with multiple users or contributors where privilege separation is critical. The lack of known exploits reduces immediate risk but does not eliminate the need for proactive mitigation.

1. Monitor for official patches or updates from merkulove and apply them immediately once available to remediate the missing authorization flaw. 2. Until patches are released, restrict access to the Lottier plugin features to trusted users only, minimizing the number of accounts with privileges that could exploit the vulnerability. 3. Conduct a thorough audit of WordPress user roles and permissions to ensure least privilege principles are enforced, particularly for contributors and editors who interact with Gutenberg blocks. 4. Review and harden custom Gutenberg block configurations and access control logic to prevent unauthorized actions. 5. Implement web application firewalls (WAF) with rules to detect and block suspicious requests targeting the plugin endpoints. 6. Monitor logs for unusual activity related to the plugin, such as unexpected API calls or content modifications. 7. Educate site administrators and developers about the vulnerability and the importance of timely updates and access control management. 8. Consider isolating or disabling the plugin if it is not essential, to reduce attack surface.