Improper input validation in Getkirby Kirby
CVE-2026-29905
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.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 44.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/getkirby/kirby/releases/tag/5.2.0-rc.1 (Product)
- drive.google.com/file/d/1MwvvSYIwnC8kOIzjycGMQZw4d2K2ef8h/view (Exploit)
- github.com/Stalin-143/CVE-2026-29905 (Third Party Advisory)
Frequently asked questions
- What is CVE-2026-29905?
- CVE-2026-29905 is a medium-severity vulnerability in Getkirby Kirby, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2026-03-26.
- How severe is CVE-2026-29905?
- Medium severity. CVSS v3 base score is 6.5 out of 10.