CVE-2025-65591 identifies a Cross Site Scripting (XSS) vulnerability in nopCommerce version 4.90.0, specifically within the Currencies functionality. nopCommerce is an open-source e-commerce platform widely used for online retail operations. The vulnerability arises because the application fails to properly sanitize or encode user-supplied input related to currency data, allowing attackers to inject malicious JavaScript code. When a victim accesses a page that processes or displays this malicious input, the injected script executes in their browser context. This can lead to theft of session cookies, redirection to phishing sites, or execution of unauthorized actions on behalf of the user. Although no CVSS score or patch is currently available, the vulnerability is publicly disclosed and reserved by MITRE as of November 2025. No known exploits have been reported in the wild, but the nature of XSS vulnerabilities makes them relatively easy to exploit, especially in environments with high user interaction. The absence of authentication requirements or complex prerequisites further increases the risk. The vulnerability compromises confidentiality and integrity primarily, with potential availability impacts if leveraged for broader attacks such as malware distribution or denial of service. nopCommerce’s role in managing e-commerce transactions means that exploitation could damage customer trust, lead to financial fraud, and expose sensitive business data. The lack of immediate patches necessitates proactive mitigation by affected organizations.

For European organizations, the impact of this XSS vulnerability in nopCommerce 4.90.0 can be significant. E-commerce platforms are critical for business operations, and exploitation could lead to customer data theft, including personal and payment information, undermining GDPR compliance and resulting in regulatory penalties. Attackers could hijack user sessions, perform fraudulent transactions, or inject malicious content that damages brand reputation. The integrity of pricing and currency data could be compromised, causing financial discrepancies. Additionally, the vulnerability could be used as a foothold for further attacks within the corporate network. Given the widespread use of nopCommerce in Europe, especially among small and medium enterprises, the risk extends to a broad range of sectors including retail, services, and digital goods. The potential for customer trust erosion and financial loss makes this vulnerability a high priority for mitigation.

To mitigate CVE-2025-65591, organizations should first verify if they are running nopCommerce version 4.90.0 and assess exposure of the Currencies functionality to untrusted input. Immediate steps include implementing strict input validation and output encoding for all currency-related fields to prevent script injection. Deploying a Web Application Firewall (WAF) with robust XSS detection and blocking capabilities can provide an additional protective layer. Monitoring web logs and user activity for unusual patterns indicative of XSS exploitation attempts is critical. Organizations should also prepare to apply patches or updates from nopCommerce as soon as they become available. In the interim, consider disabling or restricting access to the vulnerable Currencies feature if feasible. Educating developers and administrators about secure coding practices and regular security testing, including automated scanning for XSS vulnerabilities, will reduce future risks. Finally, ensure incident response plans include procedures for handling XSS incidents to minimize damage.