CVE-2025-58990 is a medium-severity Stored Cross-Site Scripting (XSS) vulnerability identified in HasTech's ShopLentor e-commerce platform, affecting versions up to 3.2.0. The vulnerability arises from improper neutralization of user-supplied input during web page generation, classified under CWE-79. Specifically, the flaw allows malicious actors with at least limited privileges (PR:L) and requiring user interaction (UI:R) to inject and store malicious scripts within the ShopLentor application. When other users or administrators access the affected pages, the injected scripts execute in their browsers, potentially leading to session hijacking, credential theft, defacement, or unauthorized actions performed on behalf of the victim. The CVSS 3.1 base score of 6.5 reflects a medium severity, with an attack vector of network (AV:N), low attack complexity (AC:L), partial privileges required, and a scope change (S:C) indicating that the vulnerability affects resources beyond the initially compromised component. The impact affects confidentiality, integrity, and availability to a limited extent (C:L/I:L/A:L). No known exploits are currently reported in the wild, and no official patches have been published yet. The vulnerability was reserved and published in early September 2025, indicating it is a recent discovery. Stored XSS vulnerabilities are particularly dangerous in e-commerce platforms like ShopLentor because they can compromise customer trust, lead to financial fraud, and facilitate further attacks within the platform's ecosystem.

For European organizations using ShopLentor, this vulnerability poses a significant risk to both their operational security and customer data privacy. Exploitation could lead to unauthorized access to user accounts, theft of sensitive customer information such as payment details, and manipulation of transaction data. This can result in financial losses, reputational damage, and regulatory penalties under GDPR due to data breaches. Additionally, attackers could leverage the XSS flaw to distribute malware or conduct phishing campaigns targeting European customers. The scope change in the vulnerability indicates that the impact could extend beyond the initial compromised component, potentially affecting other integrated systems or modules within the ShopLentor environment. Given the e-commerce sector's critical role in European economies and the high sensitivity of personal data involved, the vulnerability could disrupt business continuity and customer trust if exploited.

European organizations should prioritize the following mitigation steps: 1) Immediately audit all user input fields and stored content within ShopLentor for proper input validation and output encoding to prevent script injection. 2) Implement Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 3) Enforce strict user privilege management to limit the ability of low-privileged users to submit content that could be rendered to others. 4) Monitor application logs and user activity for unusual behavior indicative of XSS exploitation attempts. 5) Engage with HasTech for timely updates and patches; if unavailable, consider applying custom patches or workarounds such as sanitizing inputs at the web application firewall (WAF) level. 6) Educate administrators and users about the risks of clicking on suspicious links or interacting with untrusted content within the platform. 7) Conduct regular security assessments and penetration testing focusing on XSS vulnerabilities. These steps go beyond generic advice by emphasizing layered defenses, proactive monitoring, and privilege management tailored to the ShopLentor environment.