Auth bypass in Getkirby Kirby
CVE-2026-42174
Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, user avatar creation, replacement and deletion are not gated by user update permissions. This issue has been patched in versions 4.9.0 and 5.4.0.
Vulnerability class: Broken Access Control
EPSS: 0.000 (0.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Getkirby Kirby — versions < 4.9.0, >= 5.0.0, < 5.4.0
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_MISC, Release Notes)
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-42174?
- CVE-2026-42174 is a medium-severity vulnerability in Getkirby Kirby, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-05-09.
- How severe is CVE-2026-42174?
- Medium severity. CVSS v3 base score is 4.3 out of 10.