CVE-2025-58964 is a reflected Cross-site Scripting (XSS) vulnerability affecting skygroup's Enzy software versions before 1.6.4. The root cause is improper neutralization of user-supplied input during the generation of web pages, which allows attackers to inject malicious JavaScript code that is reflected back to the user's browser. This vulnerability does not require authentication (PR:N) but does require user interaction (UI:R), such as clicking a maliciously crafted URL. The attack vector is network-based (AV:N), meaning it can be exploited remotely over the internet. The vulnerability has a CVSS v3.1 base score of 7.1, categorized as high severity, reflecting its potential to compromise confidentiality, integrity, and availability (C:L/I:L/A:L) of affected systems. The scope is changed (S:C), indicating that exploitation could affect resources beyond the vulnerable component. Although no public exploits have been reported yet, the nature of reflected XSS makes it a common and dangerous attack vector for session hijacking, credential theft, phishing, and delivering further malware. The vulnerability affects all versions of Enzy prior to 1.6.4, but the exact range is unspecified beyond that. No official patches or mitigation links are currently provided, but remediation typically involves proper input validation, output encoding, and applying vendor patches once available.

For European organizations, the impact of CVE-2025-58964 can be significant, especially for those relying on skygroup Enzy for web-based applications or services. Successful exploitation can lead to theft of session cookies, user credentials, and sensitive data, enabling attackers to impersonate users or escalate privileges. This can compromise internal systems, customer data, and intellectual property. The reflected XSS can also be used as a vector for delivering malware or conducting phishing attacks, increasing the risk of broader compromise. Organizations in sectors such as finance, healthcare, government, and critical infrastructure are particularly vulnerable due to the sensitivity of their data and regulatory requirements like GDPR. Additionally, the vulnerability's ability to affect availability through potential injection of disruptive scripts can impact service continuity. The lack of known exploits in the wild currently provides a window for proactive mitigation, but the ease of exploitation and high severity score necessitate urgent attention.

European organizations should implement a multi-layered mitigation approach: 1) Immediately audit and monitor all instances of skygroup Enzy to identify affected versions and usage scope. 2) Apply vendor patches promptly once released; if unavailable, implement virtual patching via web application firewalls (WAFs) to detect and block malicious input patterns targeting the XSS vulnerability. 3) Enforce strict input validation and output encoding on all user-supplied data within Enzy applications to neutralize malicious scripts. 4) Educate users about the risks of clicking untrusted links and encourage cautious behavior to reduce the likelihood of user interaction exploitation. 5) Conduct regular security assessments and penetration testing focusing on web application vulnerabilities. 6) Monitor logs and network traffic for unusual activity indicative of attempted XSS exploitation. 7) Employ Content Security Policy (CSP) headers to restrict script execution and reduce impact if exploitation occurs. 8) Coordinate with skygroup for timely updates and vulnerability disclosures. These steps go beyond generic advice by focusing on interim controls and user awareness until official patches are available.