CVE-2026-42137

Name: CVE-2026-42137
Creator: NVD / NIST
Published: 2026-05-09T04:16:22.653+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2026-42137 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. 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. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS 4.0

7.1/10

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.30%

22.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Getkirby	Kirby	< 4.9.0
Getkirby	Kirby	>= 5.0.0, < 5.4.0

References

https://github.com/getkirby/kirby/releases/tag/4.9.0Release Notes
https://github.com/getkirby/kirby/releases/tag/5.4.0Release Notes
https://github.com/getkirby/kirby/security/advisories/GHSA-85x2-r8xv-ww8cPatch, Vendor Advisory

Timeline

Published: May 9, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-42137?

How severe is CVE-2026-42137?

CVE-2026-42137 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2026-42137?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-42137?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST