CVE-2026-42137
published 2026-05-09CVE-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…
PriorityP340medium6.5CVSS 3.1
AVNACLPRLUINSUCHINAN
EPSS
0.30%
22.0th percentile
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.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| getkirby | cms | >= 0 < 4.9.0 | 4.9.0 |
| getkirby | cms | >= 5.0.0 < 5.4.0 | 5.4.0 |
| getkirby | kirby | < 4.9.0 | 4.9.0 |
| getkirby | kirby | — | — |
| getkirby | kirby | >= 5.0.0 < 5.4.0 | 5.4.0 |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
nvdv4.07.1HIGHCVSS: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
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VulDB
getkirby up to 4.8.x/5.3.x REST API authorization (GHSA-85x2-r8xv-ww8c)
vuldb·2026-05-09·CVSS 7.1
CVE-2026-42137 [HIGH] getkirby up to 4.8.x/5.3.x REST API authorization (GHSA-85x2-r8xv-ww8c)
A vulnerability categorized as problematic has been discovered in getkirby kirby up to 4.8.x/5.3.x. This affects an unknown function of the component REST API. The manipulation results in missing authorization.
This vulnerability is known as CVE-2026-42137. It is possible to launch the attack remotely. No exploit is available.
It is advisable to upgrade the affected component.
GHSA
Kirby CMS's `pages.access/list` and `files.access/list` permissions are not consistently checked in the Panel and REST API
ghsa·2026-04-30
CVE-2026-42137 [HIGH] CWE-862 Kirby CMS's `pages.access/list` and `files.access/list` permissions are not consistently checked in the Panel and REST API
Kirby CMS's `pages.access/list` and `files.access/list` permissions are not consistently checked in the Panel and REST API
### TL;DR
This vulnerability affects all Kirby sites where users of a particular role have no permission to access or list pages or files (`pages.access`, `pages.list`, `files.access` or `files.list` permission is disabled). This can be due to configuration in the user blueprint(s), via `options` in the model blueprint(s) or via a combination of both settings.
**This vulnerability is of high severity for affected sites.**
Consumers' Kirby sites are *not* affected if they intend all users to be able to access all pages and files of the site. The vulnerability can only be exploited by authenticated users. Write actions are *not* affected by this vulnerability.
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No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-05-09
Published