CVE-2025-15437 is a cross-site scripting (XSS) vulnerability identified in LigeroSmart, a web-based application platform, affecting all versions up to 6.1.24. The vulnerability resides in the Environment Variable Handler component, where improper sanitization of the REQUEST_URI parameter allows attackers to inject malicious JavaScript code. This injection occurs because the application fails to correctly validate or encode user-supplied input in the URL, enabling script execution in the context of the victim’s browser. The attack vector is remote and does not require authentication, but successful exploitation depends on user interaction, such as clicking a malicious link crafted to exploit the vulnerability. The vulnerability can lead to client-side impacts including session hijacking, credential theft, or unauthorized actions performed on behalf of the user. Although no active exploits have been reported in the wild, the public disclosure of the vulnerability and availability of a patch (commit 264ac5b2be5b3c673ebd8cb862e673f5d300d9a7) necessitate prompt remediation. The vendor has released fixed versions 6.1.26 and 6.3 that properly sanitize the REQUEST_URI input, preventing script injection. The CVSS 4.0 base score of 5.1 reflects a medium severity, with network attack vector, low attack complexity, no privileges required, but user interaction needed. The vulnerability does not affect confidentiality or availability directly but impacts integrity and user trust.

For European organizations, this vulnerability poses a moderate risk primarily to web application users and administrators relying on LigeroSmart versions up to 6.1.24. Successful exploitation could enable attackers to execute arbitrary scripts in users’ browsers, potentially leading to session hijacking, theft of sensitive information such as authentication tokens, or unauthorized actions performed with the user’s privileges. This could compromise internal systems, especially if LigeroSmart is used for critical business processes or sensitive data management. The risk is heightened in sectors with high regulatory requirements for data protection, such as finance, healthcare, and government. Additionally, phishing campaigns leveraging this vulnerability could target European users, increasing the attack surface. Although the vulnerability does not directly impact system availability or confidentiality at the server level, the indirect effects on user trust and data integrity can have significant operational and reputational consequences.

European organizations should immediately upgrade LigeroSmart installations to version 6.1.26 or later, or version 6.3, which contain the official patch addressing this XSS vulnerability. Until upgrades are applied, organizations should implement web application firewall (WAF) rules to detect and block suspicious REQUEST_URI patterns that may contain script payloads. Security teams should conduct thorough input validation and output encoding reviews for any custom LigeroSmart integrations or plugins. User awareness training should emphasize caution with unsolicited links to mitigate user interaction risks. Additionally, organizations should monitor logs for unusual URL requests and anomalous user behavior indicative of exploitation attempts. Employing Content Security Policy (CSP) headers can help reduce the impact of potential XSS attacks by restricting script execution sources. Regular vulnerability scanning and penetration testing focused on web application security will help identify residual or related issues.