CVE-2025-13531 identifies a stored Cross-Site Scripting (XSS) vulnerability in the Stylish Order Form Builder plugin for WordPress, developed by hayyatapps. The flaw exists in all versions up to and including 1.0 due to insufficient sanitization and escaping of the 'product_name' parameter during web page generation. This improper neutralization of input (CWE-79) allows authenticated users with Subscriber-level privileges or higher to inject arbitrary JavaScript code that is persistently stored and executed in the context of other users viewing the affected pages. The vulnerability is exploitable remotely over the network without user interaction, with low attack complexity, but requires at least low-level authenticated access. The CVSS 3.1 score of 6.4 reflects a medium severity, with impacts primarily on confidentiality and integrity, as attackers can steal session cookies, perform actions on behalf of other users, or manipulate displayed content. No patches or known exploits are currently reported, but the risk remains significant due to the widespread use of WordPress and the plugin’s role in order form management. The vulnerability’s scope is limited to sites using this specific plugin, but the potential for lateral movement or privilege escalation exists if attackers leverage the injected scripts effectively. The vulnerability was reserved in November 2025 and published in January 2026, indicating recent discovery and disclosure.

For European organizations, the impact of CVE-2025-13531 can be substantial, especially for those relying on the Stylish Order Form Builder plugin in their WordPress-based e-commerce or order management systems. Exploitation could lead to theft of sensitive customer data, session hijacking, unauthorized actions performed under legitimate user sessions, and defacement or manipulation of order forms, undermining customer trust and potentially violating GDPR requirements regarding data protection. The persistent nature of stored XSS means that multiple users can be affected over time, increasing the attack surface. Organizations with public-facing order forms are particularly vulnerable to targeted phishing campaigns or malware distribution via injected scripts. Additionally, attackers could use the vulnerability as a foothold for further compromise within the network. The medium CVSS score suggests moderate risk, but the actual impact depends on the plugin’s deployment scale and the sensitivity of the data handled. Failure to address this vulnerability could lead to reputational damage, regulatory penalties, and financial losses.

1. Monitor hayyatapps announcements and WordPress plugin repositories for official patches and apply them promptly once released. 2. Until patches are available, implement strict input validation and output encoding on the 'product_name' parameter at the application or web server level to neutralize malicious scripts. 3. Restrict Subscriber-level user permissions to the minimum necessary and review user roles to limit the ability to inject content. 4. Employ Web Application Firewalls (WAFs) with custom rules to detect and block suspicious payloads targeting the vulnerable parameter. 5. Conduct regular security audits and code reviews of custom plugins and themes to identify similar vulnerabilities. 6. Educate administrators and users about the risks of XSS and encourage vigilance against phishing or suspicious site behavior. 7. Enable Content Security Policy (CSP) headers to reduce the impact of injected scripts by restricting script sources. 8. Monitor logs for unusual activities related to order form submissions or product name changes. 9. Consider isolating or temporarily disabling the plugin if immediate patching is not feasible and the risk is high. 10. Maintain regular backups to enable recovery in case of compromise.