CVE-2025-59004 identifies a reflected Cross-site Scripting (XSS) vulnerability in the pco_58 WC Return products, specifically affecting versions up to 1.5. The vulnerability stems from improper neutralization of user-supplied input during the generation of web pages, which enables attackers to inject malicious scripts that are reflected back to users. When a victim interacts with a crafted URL or input, the malicious script executes within their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability does not require any privileges to exploit but does require user interaction, such as clicking a malicious link. The CVSS v3.1 base score is 7.1, indicating a high severity level, with an attack vector of network (remote), low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability. Although no known exploits are currently reported in the wild, the vulnerability poses a significant risk to organizations using the affected WC Return products, especially those exposing web interfaces to external users. The lack of available patches at the time of publication necessitates immediate mitigation efforts through input validation, output encoding, and security headers like Content Security Policy (CSP).

The reflected XSS vulnerability in WC Return products can have serious consequences for European organizations, particularly those in e-commerce, retail, and customer service sectors that rely on these products for handling returns and related workflows. Exploitation could lead to theft of session cookies, enabling attackers to impersonate legitimate users and access sensitive information or perform unauthorized transactions. It could also facilitate phishing attacks by injecting deceptive content into trusted web pages, damaging brand reputation and customer trust. Additionally, attackers might disrupt service availability or integrity by injecting scripts that alter page content or functionality. The vulnerability's network-based attack vector and lack of required privileges increase the risk of widespread exploitation if left unmitigated. Organizations handling personal data under GDPR could face regulatory penalties if such an incident leads to data breaches. Therefore, the impact extends beyond technical compromise to legal and financial repercussions.

To mitigate CVE-2025-59004 effectively, organizations should: 1) Monitor vendor communications closely and apply official patches or updates for WC Return products immediately upon release. 2) Implement strict input validation on all user-supplied data, ensuring that special characters are properly sanitized or escaped before inclusion in web pages. 3) Employ contextual output encoding (e.g., HTML entity encoding) to neutralize potentially malicious input during page rendering. 4) Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of any successful injection. 5) Conduct regular security assessments and penetration testing focused on XSS vulnerabilities in web applications. 6) Educate users about the risks of clicking unknown or suspicious links to reduce the likelihood of successful exploitation. 7) Utilize Web Application Firewalls (WAFs) with updated signatures to detect and block attempted XSS attacks targeting this vulnerability. 8) Review and harden session management practices to limit the damage from stolen session tokens. These measures combined will reduce the attack surface and improve resilience against exploitation.