CVE-2026-29905: Getkirby Kirby

Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Kirby CMS through 5.1.4 allows an authenticated user with 'Editor' permissions to cause a persistent Denial of Service (DoS) via a malformed image upload. The application fails to properly validate the return value of the PHP getimagesize() function. When the system attempts to process this file for metadata or thumbnail generation, it triggers a fatal TypeError.

Affected products

• Getkirby Kirby: up to and including 5.1.4

Published 2026-03-26. Last modified 2026-06-17.