CVE-2025-15437 is a cross-site scripting vulnerability identified in LigeroSmart, a software product used for business or organizational management, affecting all versions up to 6.1.24. The flaw exists in the Environment Variable Handler component, where the REQUEST_URI parameter is not properly sanitized before being processed. This improper input validation allows an attacker to inject malicious JavaScript code remotely by manipulating the REQUEST_URI argument. When a victim user accesses a crafted URL, the injected script executes in their browser context, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The vulnerability does not require the attacker to have privileges on the system (low privileges suffice), nor does it require the victim to be authenticated, but user interaction is necessary to trigger the payload. The CVSS 4.0 score is 5.1, reflecting a medium severity level due to the ease of exploitation combined with limited impact on confidentiality and integrity. The vendor has released patches in versions 6.1.26 and 6.3, addressing the issue by properly sanitizing the REQUEST_URI input. The patch is identified by commit 264ac5b2be5b3c673ebd8cb862e673f5d300d9a7. No known exploits have been observed in the wild, but public disclosure of the exploit increases the risk of opportunistic attacks. Organizations running vulnerable LigeroSmart versions should upgrade promptly to mitigate the risk.

For European organizations, this vulnerability poses a risk primarily to web application security and user data confidentiality. Successful exploitation could allow attackers to steal session cookies, impersonate users, or perform unauthorized actions within the affected application. This can lead to data breaches, unauthorized access to sensitive business information, and potential reputational damage. Given that LigeroSmart is used in various sectors including business management and possibly public sector entities, the impact could extend to disruption of organizational workflows and loss of trust. The medium severity rating indicates that while the vulnerability is not critical, it is exploitable remotely without authentication, increasing the attack surface. Organizations with high user interaction or public-facing LigeroSmart deployments are particularly vulnerable. Additionally, regulatory frameworks such as GDPR impose strict requirements on protecting personal data, so exploitation leading to data leakage could result in legal and financial penalties.

European organizations should immediately upgrade LigeroSmart installations to version 6.1.26 or 6.3, where the vulnerability is patched. In parallel, implement web application firewall (WAF) rules to detect and block suspicious REQUEST_URI patterns that may contain script injection attempts. Conduct thorough input validation and output encoding on all user-supplied data within the application to prevent similar XSS issues. Educate users about the risks of clicking on unknown or suspicious links to reduce the likelihood of successful social engineering exploitation. Regularly audit and monitor web server logs for anomalous requests targeting the REQUEST_URI parameter. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. Finally, maintain an up-to-date inventory of LigeroSmart deployments and ensure timely application of security patches as part of a robust vulnerability management program.