CVE-2026-42051: CWE-862: Missing Authorization in getkirby kirby
CVE-2026-42051 is a medium severity vulnerability in the Kirby content management system. Prior to versions 4. 9. 0 and 5. 4. 0, the system API endpoint improperly authorizes access, allowing authenticated users to obtain license data and the installed version. This issue has been addressed in Kirby versions 4. 9. 0 and 5. 4.
AI Analysis
Technical Summary
Kirby CMS versions before 4.9.0 and between 5.0.0 and 5.4.0 contain a missing authorization vulnerability (CWE-862) in an API endpoint. Authenticated users can access sensitive information such as license details and the installed software version. The vulnerability has a CVSS 4.0 base score of 5.3, indicating medium severity. The issue is fixed in versions 4.9.0 and 5.4.0.
Potential Impact
Authenticated users on affected Kirby versions can retrieve license information and version details that should be restricted. While this does not directly allow privilege escalation or code execution, leaking license and version data can aid attackers in reconnaissance and targeted attacks.
Mitigation Recommendations
Upgrade Kirby to version 4.9.0 or later if using the 4.x branch, or to version 5.4.0 or later if using the 5.x branch. These versions contain the official fix for this authorization issue. No additional mitigation is indicated by the vendor advisory.
CVE-2026-42051: CWE-862: Missing Authorization in getkirby kirby
Description
CVE-2026-42051 is a medium severity vulnerability in the Kirby content management system. Prior to versions 4. 9. 0 and 5. 4. 0, the system API endpoint improperly authorizes access, allowing authenticated users to obtain license data and the installed version. This issue has been addressed in Kirby versions 4. 9. 0 and 5. 4.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Kirby CMS versions before 4.9.0 and between 5.0.0 and 5.4.0 contain a missing authorization vulnerability (CWE-862) in an API endpoint. Authenticated users can access sensitive information such as license details and the installed software version. The vulnerability has a CVSS 4.0 base score of 5.3, indicating medium severity. The issue is fixed in versions 4.9.0 and 5.4.0.
Potential Impact
Authenticated users on affected Kirby versions can retrieve license information and version details that should be restricted. While this does not directly allow privilege escalation or code execution, leaking license and version data can aid attackers in reconnaissance and targeted attacks.
Mitigation Recommendations
Upgrade Kirby to version 4.9.0 or later if using the 4.x branch, or to version 5.4.0 or later if using the 5.x branch. These versions contain the official fix for this authorization issue. No additional mitigation is indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-23T16:05:01.710Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69ffe1afcbff5d8610eac9ee
Added to database: 5/10/2026, 1:38:55 AM
Last enriched: 5/10/2026, 1:39:21 AM
Last updated: 5/10/2026, 8:55:22 AM
Views: 7
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