CVE-2025-5955 is a high-severity authentication bypass vulnerability affecting the Service Finder SMS System plugin developed by aonetheme for WordPress. This vulnerability exists in all versions up to and including 2.0.0. The root cause is the plugin's failure to properly verify a user's phone number before allowing login. As a result, an unauthenticated attacker can bypass authentication controls and log in as arbitrary users without needing valid credentials or any user interaction. The vulnerability is classified under CWE-288, which pertains to authentication bypass using an alternate path or channel. The CVSS v3.1 base score is 8.1, reflecting high impact on confidentiality, integrity, and availability, with the attack vector being network-based, requiring no privileges or user interaction, but with high attack complexity. Although no known exploits are currently reported in the wild, the vulnerability's nature makes it a critical risk for websites using this plugin. Exploitation could allow attackers to impersonate legitimate users, potentially including administrators, leading to unauthorized access to sensitive data, modification of site content, or disruption of services. Given that the plugin is designed for WordPress, a widely used content management system, the vulnerability could affect a broad range of websites that rely on the Service Finder SMS System for user authentication via phone numbers.

For European organizations, this vulnerability poses significant risks, especially for businesses and services that use the Service Finder SMS System plugin to manage user authentication. Unauthorized access could lead to data breaches involving personal and financial information, undermining GDPR compliance and resulting in legal and financial penalties. The ability to impersonate users may also facilitate fraud, unauthorized transactions, or manipulation of service offerings. Additionally, attackers could disrupt service availability or deface websites, damaging brand reputation and customer trust. Organizations in sectors such as e-commerce, healthcare, education, and public services that utilize WordPress and this plugin are particularly vulnerable. The cross-border nature of web services means that exploitation could have cascading effects across multiple European countries, complicating incident response and regulatory reporting.

Immediate mitigation steps include upgrading the Service Finder SMS System plugin to a patched version once released by aonetheme. Until a patch is available, organizations should consider disabling the plugin or replacing it with alternative authentication mechanisms that properly verify user identities. Implementing multi-factor authentication (MFA) at the WordPress login level can provide an additional security layer to mitigate unauthorized access. Monitoring login activities for unusual patterns, such as logins from unfamiliar IP addresses or rapid successive logins, can help detect exploitation attempts. Web application firewalls (WAFs) should be configured to detect and block suspicious requests targeting the plugin's authentication endpoints. Regular security audits and penetration testing focusing on authentication flows are recommended to identify and remediate similar weaknesses. Finally, organizations should ensure that incident response plans include procedures for vulnerabilities in third-party plugins and maintain up-to-date inventories of all WordPress plugins in use.