Auth bypass in Getkirby Kirby
CVE-2026-42137
Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, `pages.access/list` and `files.access/list` permissions are not consistently checked in the Panel and REST API. This issue has been patched in versions 4.9.0 and 5.4.0.
Vulnerability class: Broken Access Control
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:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Getkirby Kirby — versions < 4.9.0, >= 5.0.0, < 5.4.0
Weakness classification (CWE)
References
- github.com/getkirby/kirby/releases/tag/4.9.0 (Release Notes)
- github.com/getkirby/kirby/releases/tag/5.4.0 (Release Notes)
- github.com/getkirby/kirby/security/advisories/GHSA-85x2-r8xv-ww8c (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42137?
- CVE-2026-42137 is a medium-severity vulnerability in Getkirby Kirby, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-05-09.
- How severe is CVE-2026-42137?
- Medium severity. CVSS v3 base score is 6.5 out of 10.