CVE-2026-42051: Getkirby Kirby

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, the system API endpoint leaks license data and installed version to authenticated users. This issue has been patched in versions 4.9.0 and 5.4.0.

Affected products

• Getkirby Kirby: before 4.9.0 (fixed in 4.9.0); from 5.0.0, before 5.4.0 (fixed in 5.4.0)

Published 2026-05-09. Last modified 2026-07-24.