CVE-2025-13619 is a critical security vulnerability classified under CWE-269 (Improper Privilege Management) found in the Flex Store Users plugin for WordPress developed by CMSSuperHeroes. The vulnerability affects all versions up to and including 1.1.0. The root cause lies in the 'fsUserHandle::signup' and 'fsSellerRole::add_role_seller' functions, which fail to properly restrict the user roles that can be assigned during the registration process. Specifically, an unauthenticated attacker can supply the 'administrator' role parameter during signup, thereby gaining full administrative privileges on the WordPress site. This flaw is exacerbated if the Flex Store Seller plugin is also activated, as the 'fs_type' parameter can be exploited to facilitate the attack. The vulnerability requires no authentication or user interaction, making it trivially exploitable remotely over the network. The CVSS v3.1 base score is 9.8, reflecting the ease of exploitation and the severe impact on confidentiality, integrity, and availability. Successful exploitation results in complete site takeover, allowing attackers to manipulate content, install malware, or pivot to other network assets. No public exploits have been reported yet, but the critical nature and simplicity of the attack vector make it a high priority for patching and mitigation. The lack of an official patch at the time of disclosure necessitates immediate defensive measures by site administrators.

For European organizations, the impact of CVE-2025-13619 is significant. WordPress is widely used across Europe for corporate websites, e-commerce platforms, and content management, making this vulnerability a critical risk. An attacker exploiting this flaw can gain full administrative control over affected WordPress sites, leading to data breaches, defacement, ransomware deployment, or use of the site as a launchpad for further attacks within the network. This can result in loss of customer trust, regulatory penalties under GDPR for data breaches, and operational downtime. E-commerce sites using the Flex Store Users plugin are particularly vulnerable to financial fraud and theft of sensitive customer data. The vulnerability's ease of exploitation and lack of required authentication increase the likelihood of automated attacks targeting European organizations. Additionally, organizations in sectors such as finance, healthcare, and government, which often rely on WordPress for public-facing services, face heightened risks of reputational damage and compliance violations.

Until an official patch is released, European organizations should implement the following mitigations: 1) Disable or deactivate the Flex Store Users plugin and the Flex Store Seller plugin if not essential. 2) Restrict user registration on WordPress sites or implement manual approval workflows to prevent unauthorized account creation. 3) Employ Web Application Firewalls (WAFs) with custom rules to block requests containing suspicious parameters like 'administrator' role assignments or 'fs_type' exploitation attempts. 4) Monitor WordPress user registrations and audit logs for unusual activity or new administrator accounts. 5) Harden WordPress installations by limiting plugin usage to trusted and regularly updated components. 6) Implement multi-factor authentication (MFA) for all administrator accounts to reduce the impact of compromised credentials. 7) Regularly back up website data and configurations to enable rapid recovery in case of compromise. 8) Stay informed about updates from CMSSuperHeroes and apply patches immediately upon release. These steps go beyond generic advice by focusing on specific plugin-related controls and proactive monitoring tailored to this vulnerability.