CVE-2025-58047 is a vulnerability in Volto, the React-based frontend for the Plone Content Management System, identified as CWE-755 (Improper Handling of Exceptional Conditions). It affects versions from 19.0.0-alpha.1 up to but not including 19.0.0-alpha.4, 18.0.0 up to but not including 18.24.0, 17.0.0 up to but not including 17.22.1, and all versions prior to 16.34.0. The flaw allows an unauthenticated attacker to trigger a server crash by visiting a specially crafted URL, causing the NodeJS server process that runs Volto to quit unexpectedly due to unhandled exceptions. This leads to a denial of service condition, impacting the availability of the web frontend. The vulnerability does not affect confidentiality or integrity, as it does not allow data access or modification. The issue has been addressed in versions 16.34.0, 17.22.1, 18.24.0, and 19.0.0-alpha.4 by improving error handling to prevent server crashes. While no known exploits have been reported in the wild, the vulnerability is straightforward to exploit remotely without authentication or user interaction, making unpatched systems vulnerable to service disruption. Organizations relying on Volto for their Plone CMS frontend should upgrade promptly and consider implementing process monitoring and automatic restarts to mitigate downtime caused by crashes.

For European organizations, this vulnerability poses a significant risk to the availability of websites and services powered by Plone CMS with the Volto frontend. Since Volto is used in various sectors including government, education, and enterprises, a successful exploit could lead to denial of service, disrupting access to critical information and services. This could affect public-facing portals, intranets, and other web applications, potentially causing operational delays and reputational damage. The lack of confidentiality or integrity impact limits the risk to data breaches, but availability interruptions can still have severe consequences, especially for public sector entities and organizations with high uptime requirements. The ease of exploitation by anonymous users increases the threat level, as attackers do not need credentials or complex attack vectors. European organizations with automated process restarts may reduce downtime but still face service interruptions. The vulnerability's presence in multiple versions means that organizations with delayed patching cycles or legacy deployments are particularly at risk.

1. Upgrade Volto to the fixed versions: 16.34.0, 17.22.1, 18.24.0, or 19.0.0-alpha.4 or later to ensure the vulnerability is patched. 2. Implement robust process supervision and automatic restart mechanisms (e.g., using PM2, systemd, or similar tools) to minimize downtime if the server crashes. 3. Monitor web server logs and application behavior for unusual requests or frequent crashes that may indicate exploitation attempts. 4. Restrict access to the Volto NodeJS server where possible, using network segmentation or firewall rules to limit exposure to untrusted networks. 5. Conduct regular security audits and vulnerability scans to detect outdated versions of Volto and other components. 6. Educate development and operations teams about the importance of timely patching and monitoring for availability issues. 7. Consider implementing Web Application Firewalls (WAFs) with rules to detect and block suspicious URL patterns that could trigger the crash. 8. Maintain backups and incident response plans to quickly recover from potential denial of service events.