CVE-2025-58229 is a Stored Cross-Site Scripting (XSS) vulnerability classified under CWE-79, affecting the webvitaly Sitekit product up to version 2.0. Stored XSS occurs when malicious input is improperly neutralized during web page generation and is persistently stored on the server, later served to users without adequate sanitization or encoding. This vulnerability allows an attacker with at least low privileges (PR:L) and requiring user interaction (UI:R) to inject malicious scripts into web pages generated by Sitekit. When other users view these pages, the injected scripts execute in their browsers, potentially leading to theft of session tokens, user impersonation, defacement, or delivery of further malware. The CVSS v3.1 base score is 6.5 (medium severity), reflecting network attack vector (AV:N), low attack complexity (AC:L), partial privileges required (PR:L), user interaction required (UI:R), and a scope change (S:C) indicating that the vulnerability affects components beyond the initially vulnerable component. The impact includes low confidentiality, integrity, and availability impacts individually, but combined with scope change, it could affect broader system components. No known exploits are currently reported in the wild, and no patches are linked yet, indicating that mitigation may rely on configuration or manual code review until an official fix is released. The vulnerability was reserved in late August 2025 and published in September 2025, indicating recent discovery.

For European organizations using webvitaly Sitekit, this vulnerability poses a risk of persistent XSS attacks that can compromise user accounts, steal sensitive information, and potentially facilitate further attacks such as privilege escalation or lateral movement within internal networks. Since Sitekit is a web-based product, organizations with public-facing portals or intranet sites built on this platform are at risk of reputational damage and regulatory non-compliance, especially under GDPR if personal data is exposed. The requirement for low privileges and user interaction means attackers might exploit compromised or low-level user accounts to inject malicious scripts, which can then affect other users, amplifying the impact. The scope change in the CVSS vector suggests that the vulnerability could affect components beyond the immediate web interface, possibly impacting backend services or integrated modules. This could lead to broader system compromise if exploited in chained attacks. The absence of known exploits currently provides a window for proactive mitigation, but organizations should act promptly to prevent exploitation.

European organizations should immediately audit their Sitekit installations to identify affected versions (up to 2.0). Until an official patch is released, implement strict input validation and output encoding on all user-supplied data fields within Sitekit, especially those that generate web page content. Employ Content Security Policy (CSP) headers to restrict script execution sources, reducing the impact of injected scripts. Review user privilege assignments to minimize the number of users with write or content submission capabilities. Monitor web application logs for unusual input patterns or script injection attempts. Consider deploying Web Application Firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting Sitekit. Educate users about the risks of clicking suspicious links or interacting with untrusted content within the Sitekit environment. Once patches become available, prioritize timely application and verify remediation through security testing. Additionally, conduct a thorough security review of all integrated components and plugins used with Sitekit to ensure no secondary vulnerabilities exist.