CVE-2025-59004 is a reflected Cross-site Scripting (XSS) vulnerability identified in the WC Return products developed by pco_58, affecting versions up to and including 1.5. The vulnerability stems from improper neutralization of input during web page generation, which allows attackers to inject malicious JavaScript code into web pages viewed by other users. This type of reflected XSS occurs when user-supplied input is immediately included in the response page without adequate sanitization or encoding. An attacker can craft a malicious URL containing the payload, which when clicked by a victim, executes the injected script in the victim's browser context. This can lead to session hijacking, theft of sensitive information, defacement, or redirection to malicious sites. The CVSS v3.1 base score of 7.1 reflects a high severity, with an attack vector of network (remote), low attack complexity, no privileges required, but requiring user interaction. The scope is changed, indicating that the vulnerability impacts resources beyond the vulnerable component. Confidentiality, integrity, and availability are all partially impacted. No patches or known exploits are currently reported, but the vulnerability is publicly disclosed and should be addressed promptly. The lack of patch links suggests that vendors or maintainers may not have released an official fix yet, increasing the urgency for temporary mitigations.

For European organizations, the impact of CVE-2025-59004 can be significant, especially for those relying on WC Return products in their e-commerce or customer service workflows. Exploitation can lead to unauthorized access to user sessions, leakage of personal or financial data, and potential compromise of user accounts. This can damage organizational reputation, lead to regulatory non-compliance under GDPR due to data breaches, and cause operational disruptions. Attackers could leverage this vulnerability to conduct phishing campaigns or spread malware by injecting malicious scripts into trusted websites. The reflected nature of the XSS requires user interaction, but social engineering tactics can easily facilitate this. The vulnerability's ability to affect confidentiality, integrity, and availability means that both customer trust and business continuity are at risk. Organizations in sectors with high online transaction volumes or sensitive customer data are particularly vulnerable.

To mitigate CVE-2025-59004, European organizations should first monitor vendor communications for official patches and apply them immediately upon release. In the absence of patches, implement strict input validation and output encoding on all user-supplied data within the WC Return product, ensuring that special characters are properly escaped before rendering in HTML contexts. Deploy Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. Employ Web Application Firewalls (WAFs) with rules designed to detect and block reflected XSS attack patterns targeting the affected product. Conduct user awareness training to reduce the likelihood of users clicking on suspicious links. Additionally, review and harden session management mechanisms to limit the damage from session hijacking. Regularly audit web application logs for unusual activity indicative of attempted exploitation. Finally, consider isolating or restricting access to vulnerable components until a patch is available.