CVE-2026-42051 Details
Description
Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, the system API endpoint leaks license data and installed version to authenticated users. This issue has been patched in versions 4.9.0 and 5.4.0.
A vulnerability exists in Kirby, an open-source content management system, prior to versions 4.9.0 and 5.4.0. The issue arises from the system API endpoint, which inadvertently exposes license information and the installed version to authenticated users. This leak can be exploited by users with access to the Panel, potentially leading to unauthorized knowledge of the site's Kirby version and license details, which could be used for further attacks.
Users are advised to upgrade to Kirby versions 4.9.0 or 5.4.0, both of which address this vulnerability by ensuring that the system API endpoint only provides information to users who have the appropriate permissions.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 11, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/getkirby/kirby/releases/tag/4.9.0 | [email protected] | Release Notes |
| https://github.com/getkirby/kirby/releases/tag/5.4.0 | [email protected] | Release Notes |
| https://github.com/getkirby/kirby/security/advisories/GHSA-x68m-c7jf-2572 | [email protected] | PatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| getkirby kirby | < 4.9.0 >= 5.0.0, < 5.4.0 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 24, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 18, 2026 | Initial Analysis | [email protected] |
| May 9, 2026 | New CVE Received | [email protected] |