CVE-2025-58028 is a medium-severity Stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the product Designil PDPA Thailand developed by Aum Watcharapon. The vulnerability arises from improper neutralization of input during web page generation, allowing malicious actors to inject and store arbitrary scripts within the application. When other users access the affected pages, these scripts execute in their browsers, potentially leading to session hijacking, credential theft, unauthorized actions on behalf of users, or the delivery of further malicious payloads. The CVSS 3.1 base score of 6.5 reflects a network attack vector with low attack complexity, requiring privileges (PR:L) and user interaction (UI:R), and impacts confidentiality, integrity, and availability to a limited extent. The vulnerability affects all versions up to 2.0 of Designil PDPA Thailand, though exact version details are not specified. No patches or known exploits in the wild have been reported as of the publication date (September 22, 2025). Given that the product is related to PDPA (Personal Data Protection Act) compliance in Thailand, it likely handles sensitive personal data and privacy-related functions, increasing the risk associated with exploitation. Stored XSS is particularly dangerous because malicious scripts persist on the server and affect multiple users, making it a significant threat vector if exploited.

For European organizations, the impact of this vulnerability depends largely on the adoption or integration of Designil PDPA Thailand or related components in their systems, especially if they operate in or with Thai markets or have subsidiaries using this software. If European entities use this product for managing personal data or compliance workflows, exploitation could lead to unauthorized access to sensitive personal data, violating GDPR requirements and resulting in legal and financial penalties. The stored XSS could allow attackers to impersonate users, manipulate data, or exfiltrate confidential information, undermining trust and operational integrity. Even if the product is not widely used in Europe, organizations collaborating with Thai partners or processing data through interconnected systems could face indirect risks. Additionally, the presence of such vulnerabilities in privacy compliance tools raises concerns about the security posture of data protection implementations, potentially affecting European organizations’ risk assessments and vendor management decisions.

To mitigate this vulnerability effectively, organizations should: 1) Immediately audit the usage of Designil PDPA Thailand within their infrastructure or supply chain to assess exposure. 2) Implement strict input validation and output encoding on all user-supplied data to prevent script injection, following OWASP XSS prevention guidelines. 3) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 4) Monitor web application logs and user activity for unusual behavior indicative of XSS exploitation attempts. 5) Engage with the vendor (Aum Watcharapon) to obtain patches or updates as soon as they become available and apply them promptly. 6) Conduct regular security testing, including automated scanning and manual penetration testing focused on XSS vulnerabilities. 7) Educate users about the risks of clicking on suspicious links or interacting with untrusted content, since user interaction is required for exploitation. 8) Where feasible, isolate or sandbox the affected application components to limit the scope of potential compromise.