CVE-2025-58964 is a reflected Cross-site Scripting (XSS) vulnerability affecting skygroup's Enzy software versions earlier than 1.6.4. The vulnerability stems from improper neutralization of user-supplied input during dynamic web page generation, which allows attackers to inject malicious JavaScript code into web responses. When a victim user interacts with a crafted URL or input, the malicious script executes in their browser context, potentially compromising session tokens, cookies, or enabling unauthorized actions on behalf of the user. The vulnerability does not require authentication (PR:N) but does require user interaction (UI:R), such as clicking a malicious link. The CVSS 3.1 base score is 7.1, reflecting high severity due to network attack vector (AV:N), low attack complexity (AC:L), and impact on confidentiality, integrity, and availability (C:L/I:L/A:L). The scope is changed (S:C), indicating that the vulnerability affects resources beyond the vulnerable component, possibly impacting other parts of the application or user data. No public exploits have been reported yet, but the vulnerability is published and should be addressed promptly. The lack of available patches in the provided data suggests that organizations must monitor vendor advisories closely. The vulnerability is typical of reflected XSS issues, which remain a common and dangerous web security flaw, especially in applications handling sensitive user data or authentication.

For European organizations, this vulnerability poses a significant risk to web applications using skygroup Enzy, especially those handling sensitive or personal data subject to GDPR. Successful exploitation can lead to session hijacking, unauthorized data access, and manipulation of web content, undermining user trust and potentially causing regulatory penalties. The reflected XSS can be used as a vector for phishing attacks or to distribute malware, increasing the risk to end-users and corporate networks. Organizations in sectors such as finance, healthcare, government, and critical infrastructure that rely on Enzy for web services are particularly vulnerable. The vulnerability's network-based attack vector and lack of required privileges mean attackers can target a broad user base remotely. The impact on confidentiality, integrity, and availability can disrupt business operations and damage reputation. Given the interconnected nature of European digital services, exploitation in one organization could have cascading effects on partners and customers.

Organizations should immediately verify their use of skygroup Enzy and identify affected versions prior to 1.6.4. Applying vendor patches as soon as they become available is critical. In the absence of patches, implement strict input validation and sanitization on all user-supplied data, ensuring that special characters are properly encoded before rendering in HTML contexts. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts and reduce the impact of potential XSS payloads. Use HTTP-only and secure flags on cookies to protect session tokens from theft via script access. Conduct thorough security testing, including automated and manual penetration testing focused on XSS vectors. Educate users about the risks of clicking untrusted links and implement web application firewalls (WAFs) with rules to detect and block reflected XSS attempts. Monitor logs for suspicious activity indicative of attempted exploitation. Finally, maintain an incident response plan tailored to web application attacks to quickly contain and remediate any incidents.