Plone Security Advisory 20250828

On behalf of the Plone Zope Security Team and the Volto team, we announce security releases for Volto, due to the following vulnerability.

Impact

When visiting a specific URL, an anonymous user could cause the NodeJS server part of Volto to quit with an error.

Patches

The problem has been patched and the patch has been backported to Volto major versions down until 16. It is advised to upgrade to the latest patch release of your respective current major version:

• Volto 16: 16.34.0
• Volto 17: 17.22.1
• Volto 18: 18.24.0
• Volto 19: 19.0.0-alpha4

Workarounds

Make sure your setup automatically restarts processes that quit with an error. This won't prevent a crash, but it minimises downtime.

Report

The problem was discovered by FHNW, a client of Plone provider kitconcept, who shared it with the Plone Zope Security Team (security@plone.org).

Github Advisory

The same information was published to GitHub in this advisory.