CVE-2025-13619 is a critical vulnerability identified in the CMSSuperHeroes Flex Store Users plugin for WordPress, affecting all versions up to and including 1.1.0. The vulnerability stems from improper privilege management (CWE-269) in the plugin's user registration functions, specifically 'fsUserHandle::signup' and 'fsSellerRole::add_role_seller'. These functions fail to enforce restrictions on the user roles that can be assigned during registration, allowing an unauthenticated attacker to specify the 'administrator' role. This results in privilege escalation, granting the attacker full administrative control over the WordPress site. The vulnerability can be exploited remotely without any authentication or user interaction, making it highly accessible to attackers. Additionally, if the Flex Store Seller plugin is activated, the attacker can exploit the 'fs_type' parameter to facilitate the attack. The vulnerability has been assigned a CVSS 3.1 base score of 9.8, reflecting its critical severity with high impact on confidentiality, integrity, and availability. Although no known exploits have been reported in the wild to date, the straightforward exploitation path and severe consequences necessitate urgent attention. The lack of current patches means organizations must implement interim mitigations to reduce risk. This vulnerability threatens the security of WordPress sites running the affected plugin, potentially leading to complete site takeover, data theft, defacement, or further malware deployment.

For European organizations, the impact of CVE-2025-13619 is substantial. WordPress powers a significant portion of websites across Europe, including many small and medium-sized enterprises that rely on plugins like Flex Store Users for e-commerce functionality. Exploitation could lead to full administrative compromise, enabling attackers to steal sensitive customer data, manipulate or delete content, install backdoors, and disrupt business operations. This could result in reputational damage, regulatory penalties under GDPR due to data breaches, and financial losses. E-commerce sites are particularly at risk of fraud and loss of customer trust. The vulnerability's ease of exploitation means attackers can rapidly compromise multiple sites, increasing the likelihood of widespread impact. Organizations in sectors such as retail, finance, and public services that use WordPress e-commerce plugins are especially vulnerable. The absence of known exploits currently provides a window for proactive defense, but the critical nature of the flaw demands immediate action to prevent potential attacks.

1. Immediately identify and inventory all WordPress installations using the CMSSuperHeroes Flex Store Users plugin, especially versions up to 1.1.0. 2. Disable or uninstall the vulnerable plugin until a vendor patch is released. 3. If the Flex Store Seller plugin is also installed, consider disabling it to reduce attack surface related to the 'fs_type' parameter exploitation. 4. Restrict plugin installation and updates to trusted administrators only, and monitor for unauthorized plugin changes. 5. Implement web application firewall (WAF) rules to detect and block suspicious registration attempts that specify elevated roles such as 'administrator'. 6. Audit existing user accounts for unauthorized administrator accounts and remove any suspicious entries. 7. Enforce strong authentication and monitor logs for unusual activity related to user registrations and privilege changes. 8. Stay updated with vendor advisories and apply official patches immediately upon release. 9. Educate site administrators about the risks of installing unverified plugins and the importance of timely updates. 10. Consider deploying intrusion detection systems (IDS) to alert on privilege escalation attempts.