CVE-2025-5954 is a critical privilege escalation vulnerability affecting the Service Finder SMS System plugin for WordPress, developed by aonetheme. This vulnerability arises from improper privilege management (CWE-269) within the plugin's user registration process. Specifically, the function aonesms_fn_savedata_after_signup() does not enforce restrictions on user role selection during registration. As a result, an unauthenticated attacker can exploit this flaw to register an account with administrator privileges without any authentication or user interaction. This effectively allows complete takeover of the affected WordPress site, granting the attacker full control over site content, user data, and potentially the underlying server environment. The vulnerability affects all versions up to and including 2.0.0 of the plugin. The CVSS 3.1 base score is 9.8 (critical), reflecting the vulnerability's network exploitable nature (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N), unchanged scope (S:U), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H). No patches or fixes are currently available, and no known exploits have been observed in the wild yet. Given the widespread use of WordPress and the popularity of the Service Finder SMS System plugin in service-oriented websites, this vulnerability poses a significant risk to affected installations worldwide.

For European organizations, this vulnerability presents a severe risk, especially for businesses relying on WordPress-based service directories, booking platforms, or SMS communication systems integrated via the Service Finder SMS System plugin. Successful exploitation results in full administrative control over the affected website, enabling attackers to steal sensitive customer data, manipulate or delete content, deploy malware, or use the compromised site as a pivot point for further attacks within the organization's network. This can lead to significant reputational damage, regulatory non-compliance (e.g., GDPR violations due to data breaches), operational disruption, and financial losses. The critical nature of the vulnerability and the lack of required authentication or user interaction make it highly exploitable, increasing the likelihood of attacks targeting European SMEs and enterprises that use this plugin. Additionally, compromised sites could be used to launch phishing campaigns or distribute ransomware, amplifying the threat impact regionally.

Immediate mitigation steps include: 1) Audit all WordPress sites within the organization to identify installations of the Service Finder SMS System plugin, particularly versions up to 2.0.0. 2) Temporarily disable or remove the plugin until a security patch is released by the vendor. 3) Implement strict monitoring and logging of user registrations and administrative account creations to detect suspicious activity. 4) Restrict registration capabilities to trusted users only, possibly by disabling public registration or using CAPTCHA and email verification as interim controls. 5) Harden WordPress installations by enforcing the principle of least privilege for all user roles and regularly reviewing user accounts for unauthorized administrators. 6) Employ Web Application Firewalls (WAFs) with custom rules to block suspicious registration attempts targeting the vulnerable function. 7) Stay alert for vendor advisories and apply official patches immediately once available. 8) Conduct post-incident forensic analysis if compromise is suspected to identify and remediate any persistence mechanisms or backdoors.