CVE-2024-3210 is a stored cross-site scripting (XSS) vulnerability identified in the collizo4sky Paid Membership Plugin, Ecommerce, User Registration Form, Login Form, User Profile & Restrict Content – ProfilePress plugin for WordPress. This vulnerability affects all versions up to and including 4.15.5. The root cause is improper neutralization of user-supplied input in the 'reg-single-checkbox' shortcode, where insufficient input sanitization and output escaping allow authenticated users with contributor-level or higher privileges to inject arbitrary JavaScript code. Because the vulnerability is stored, the malicious script is saved on the server and executed whenever any user views the affected page, potentially compromising the confidentiality and integrity of user sessions and data. The vulnerability requires authentication at a contributor level, which lowers the attack barrier compared to administrator-only exploits. The CVSS 3.1 score of 6.4 indicates medium severity, with network attack vector, low complexity, privileges required, no user interaction, and a scope change due to the potential impact on other users. Although no known exploits are currently reported in the wild, the vulnerability poses a significant risk to websites using this plugin, especially those with multiple contributors. The vulnerability can be leveraged for session hijacking, defacement, or further privilege escalation within the WordPress environment. The plugin is widely used in WordPress ecosystems, which power a significant portion of websites globally, making this a relevant threat for many organizations. The lack of an official patch at the time of reporting necessitates immediate mitigation steps to reduce risk.

The impact of CVE-2024-3210 is primarily on the confidentiality and integrity of affected WordPress sites. An attacker with contributor-level access can inject persistent malicious scripts that execute in the context of other users visiting the compromised pages. This can lead to session hijacking, theft of sensitive information, unauthorized actions performed on behalf of users, and potential defacement of websites. Since the vulnerability affects a plugin used for membership, ecommerce, user registration, and content restriction, the risk extends to critical business functions such as user authentication and payment processing. The scope of impact is significant because the injected scripts execute in the security context of any user viewing the page, potentially affecting administrators and customers alike. Although availability is not directly impacted, the reputational damage and potential data breaches can have severe consequences for organizations. The ease of exploitation is moderate due to the need for contributor-level access, but many WordPress sites allow such roles for content creators or editors, increasing the attack surface. Organizations relying on this plugin for membership and ecommerce functionality are at higher risk, especially those with multiple contributors and high user traffic.

1. Immediately review and restrict contributor-level access to trusted users only, minimizing the number of users who can exploit this vulnerability. 2. Implement strict input validation and output escaping on all user-supplied data, particularly in the 'reg-single-checkbox' shortcode, if custom code or temporary fixes are possible. 3. Monitor website logs and user activity for unusual behavior indicative of XSS exploitation, such as unexpected script execution or unauthorized actions. 4. Use Web Application Firewalls (WAFs) with rules targeting stored XSS patterns to block malicious payloads targeting this plugin. 5. Regularly back up website data and configurations to enable rapid recovery in case of compromise. 6. Stay informed about updates from the plugin vendor and apply official patches immediately once released. 7. Consider temporarily disabling or replacing the affected plugin if mitigation is not feasible until a patch is available. 8. Educate content contributors about the risks of injecting untrusted code and enforce secure content creation policies. 9. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts on the website. 10. Conduct security audits and penetration testing focusing on user input handling in WordPress plugins.