CVE-2025-58047 is a high-severity vulnerability affecting Volto, the React-based frontend for the Plone Content Management System. The vulnerability arises from improper handling of exceptional conditions (CWE-755) in the NodeJS server component of Volto. Specifically, in affected versions ranging from before 16.34.0 up to certain pre-release versions of 19.0.0-alpha.4, an unauthenticated attacker can trigger a server crash by visiting a crafted URL. This causes the NodeJS process to quit with an error, resulting in a denial of service (DoS) condition. The vulnerability does not impact confidentiality or integrity but directly affects availability by causing downtime. The issue has been addressed in versions 16.34.0, 17.22.1, 18.24.0, and 19.0.0-alpha.4. While no known exploits are reported in the wild, the vulnerability is remotely exploitable without authentication or user interaction, making it a significant risk for publicly accessible Plone Volto frontends. The recommended mitigation includes upgrading to patched versions and implementing automatic process restarts to reduce downtime impact.

For European organizations using Plone with the Volto frontend, this vulnerability poses a risk of service disruption through denial of service attacks. Public-facing websites or intranet portals relying on Volto could experience outages, affecting business continuity, user access, and potentially damaging reputation. Sectors such as government, education, and enterprises that use Plone for content management and public information dissemination are particularly vulnerable. The ease of exploitation by anonymous users increases the likelihood of opportunistic attacks, which could be leveraged during periods of geopolitical tension or cyber campaigns targeting European institutions. Although no data breach or code execution is involved, repeated or sustained exploitation could lead to significant operational impacts and increased support costs.

European organizations should prioritize upgrading Volto to the fixed versions (16.34.0, 17.22.1, 18.24.0, or 19.0.0-alpha.4 and later). In environments where immediate patching is not feasible, implementing robust process supervision and automatic restart mechanisms (e.g., using PM2, systemd, or Docker restart policies) can minimize downtime. Additionally, web application firewalls (WAFs) or reverse proxies should be configured to detect and block suspicious URL patterns that could trigger the crash. Monitoring server logs for unusual error patterns and setting up alerting for unexpected process terminations will aid in early detection. Network segmentation and limiting public exposure of the Volto frontend to trusted users can further reduce risk. Finally, organizations should review their incident response plans to handle potential DoS events caused by this vulnerability.