CVE-2025-58047: 
JavaScript vulnerability analysis and mitigation

CVE-2025-58047 is a high-severity denial-of-service (DoS) vulnerability discovered in Volto, the ReactJS-based frontend of the Plone Content Management System (CMS). The vulnerability was disclosed on August 28, 2025, affecting Volto versions from 19.0.0-alpha.1 to before 19.0.0-alpha.4, 18.0.0 to before 18.24.0, 17.0.0 to before 17.22.1, and prior to 16.34.0. Volto serves as the default frontend for Plone 6, providing an intuitive, ReactJS-driven editing and user experience (Daily CyberSecurity, NVD).

The vulnerability has been assigned a CVSS v3.1 base score of 7.5 (High), with a vector string of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The technical issue involves a corner case in the devproxy component where an anonymous user could cause the NodeJS server part of Volto to crash by visiting a specific URL. The vulnerability is classified under CWE-755 (Improper Handling of Exceptional Conditions) (GitHub Advisory, NVD).

When successfully exploited, this vulnerability allows an unauthenticated attacker to cause a denial of service by making the NodeJS server component of Volto quit with an error. This can result in service disruption and potential downtime for websites running affected versions of Volto (OSS Security, Daily CyberSecurity).

The vulnerability has been patched in Volto versions 16.34.0, 17.22.1, 18.24.0, and 19.0.0-alpha.4. Users are strongly advised to upgrade to these patched versions. As a temporary workaround for systems that cannot be immediately updated, administrators should ensure their setup automatically restarts processes that quit with an error. While this won't prevent the crash, it helps minimize downtime (OSS Security, GitHub Advisory).

The vulnerability was initially discovered by FHNW, a client of Plone provider kitconcept, who responsibly disclosed it to the Plone Zope Security Team. The security team promptly addressed the issue by developing and backporting patches to all supported versions of Volto (GitHub Advisory).