CVE-2025-58830 is a stored Cross-site Scripting (XSS) vulnerability identified in the snagysandor Parallax Scrolling Enllax.js library, specifically affecting versions up to 0.0.6. The vulnerability arises due to improper neutralization of input during web page generation, classified under CWE-79. This flaw allows an attacker to inject malicious scripts that are persistently stored and later executed in the context of users visiting the affected web pages. The vulnerability has a CVSS v3.1 base score of 6.5, indicating a medium severity level. The vector details (AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L) reveal that the attack can be launched remotely over the network with low attack complexity, requires low privileges, and some user interaction. The scope is changed, meaning the vulnerability can affect components beyond the initially vulnerable module. The impact includes limited confidentiality, integrity, and availability losses. Stored XSS vulnerabilities can lead to session hijacking, defacement, or redirection to malicious sites, potentially compromising user data and trust. No known exploits are currently reported in the wild, and no patches have been linked yet, indicating that mitigation might rely on vendor updates or manual code review and sanitization.

For European organizations, this vulnerability poses a tangible risk especially to those using the Enllax.js library in their web applications or websites. Stored XSS can lead to unauthorized script execution in users' browsers, enabling attackers to steal session cookies, perform actions on behalf of users, or deliver malware. This can result in data breaches, reputational damage, and regulatory non-compliance under GDPR due to inadequate protection of user data. Organizations in sectors with high web presence such as e-commerce, finance, and public services are particularly vulnerable. Furthermore, the cross-site scripting can be exploited to target employees or customers, potentially leading to broader network compromise or fraud. The lack of a patch increases the urgency for interim mitigations. Given the medium severity, the impact is significant but not critical, yet the persistent nature of stored XSS means the threat can be long-lasting if not addressed.

European organizations should immediately audit their web applications to identify usage of the snagysandor Parallax Scrolling Enllax.js library, especially versions up to 0.0.6. Until an official patch is released, organizations should implement strict input validation and output encoding on all user-supplied data that interacts with the Enllax.js components. Employ Content Security Policy (CSP) headers to restrict script execution sources and reduce the impact of potential XSS payloads. Web Application Firewalls (WAFs) can be configured to detect and block common XSS attack patterns targeting this vulnerability. Regular security testing, including automated scanning and manual code reviews focusing on input sanitization, is critical. Organizations should also educate developers on secure coding practices to prevent injection flaws. Monitoring for unusual user activity or script injections in web logs can help detect exploitation attempts early. Finally, maintain communication with the vendor or community for timely patch releases and updates.