Incorrect authorization in Kirby - CVE-2026-42137
Published: April 23, 2026
Vulnerability identifier: #VU127193
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42137
CWE-ID: CWE-863
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to disclose sensitive information.
The vulnerability exists due to incorrect authorization in the Panel and REST API when handling requests for page and file listings and related models. A remote user can send crafted requests to access non-listable pages or files and disclose sensitive information.
The issue affects sites where page or file access or list permissions are disabled for a role through user blueprints, model blueprints, or both. Write actions are not affected.
Affected software
Kirby
How to mitigate CVE-2026-42137
Install security update from vendor's website.
Kirby - addressed in versions 4.9.0, 5.4.0