CVE-2025-66063 is a vulnerability classified as 'Missing Authorization' in the WP Google Review Slider plugin developed by jgwhite33, affecting all versions up to and including 17.4. The flaw arises from improperly configured access control mechanisms within the plugin, which fail to adequately verify user permissions before allowing certain actions. This enables an attacker with low privileges (PR:L) to perform unauthorized operations remotely (AV:N) without requiring user interaction (UI:N). The vulnerability impacts confidentiality and integrity to a limited extent (C:L/I:L), but does not affect availability (A:N). Specifically, attackers may be able to access or modify Google review data displayed via the plugin, potentially leading to misinformation or unauthorized data exposure. The vulnerability does not require elevated privileges beyond low-level authenticated access, making exploitation easier in environments where user accounts exist with minimal restrictions. Although no known exploits are currently reported in the wild, the vulnerability's presence in a popular WordPress plugin used for displaying Google reviews on websites presents a risk vector for website defacement, misinformation, or data leakage. The lack of patch links indicates that a fix may not yet be publicly available, emphasizing the need for proactive mitigation. The CVSS score of 5.4 reflects a medium severity level, balancing ease of exploitation with limited impact scope.

For European organizations, this vulnerability could lead to unauthorized access or modification of customer review data displayed on websites, potentially damaging brand reputation and customer trust. Organizations relying heavily on customer feedback and online reputation management, such as e-commerce, hospitality, and service industries, may face risks of misinformation or manipulation of displayed reviews. Although the direct impact on system availability is negligible, the integrity and confidentiality of displayed data could be compromised, leading to potential legal and compliance issues under GDPR if personal data is involved. Attackers exploiting this vulnerability might also use it as a foothold for further attacks on the website or its users. The medium severity suggests that while the threat is not critical, it should not be ignored, especially for organizations with significant online presence in Europe.

European organizations should immediately audit their WordPress installations to identify the presence of the WP Google Review Slider plugin and determine the version in use. Until an official patch is released, administrators should restrict access to the plugin's management interfaces to trusted users only, employing role-based access controls to limit low-privilege user capabilities. Implementing Web Application Firewalls (WAF) with custom rules to detect and block suspicious requests targeting the plugin's endpoints can reduce exploitation risk. Regularly monitoring logs for unusual access patterns related to the plugin is recommended. Organizations should subscribe to vendor and security advisories to apply patches promptly once available. Additionally, consider alternative plugins with better security track records if immediate patching is not feasible. Conducting penetration testing focused on access control weaknesses in WordPress plugins can help identify similar vulnerabilities proactively.