CVE-2021-25976: Dotnetfoundation Piranha CMS

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

In PiranhaCMS, versions 4.0.0-alpha1 to 9.2.0 are vulnerable to cross-site request forgery (CSRF) when performing various actions supported by the management system, such as deleting a user, deleting a role, editing a post, deleting a media folder etc., when an ID is known.

Affected products

• Dotnetfoundation Piranha CMS: from 4.0.1, up to and including 9.2; version 4.0.0 only

Published 2021-11-16. Last modified 2026-06-17.