CVE-2026-42051: CWE-862: Missing Authorization in getkirby kirby
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.
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 a system API endpoint. Authenticated users could retrieve sensitive information such as license details and the installed software version without proper authorization checks. The vulnerability is fixed in versions 4.9.0 and 5.4.0.
Potential Impact
The vulnerability leaks license information and the installed version number to authenticated users. While this does not directly allow privilege escalation or remote code execution, disclosure of such information could aid attackers in reconnaissance or targeted attacks. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade Kirby CMS to version 4.9.0 or later, or 5.4.0 or later, where this authorization issue has been fixed. Since the vendor advisory indicates the issue is patched in these versions, applying the official update is the recommended remediation. Patch status is confirmed by the vendor advisory.
CVE-2026-42051: CWE-862: Missing Authorization in getkirby kirby
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.
CVSS v4.0
Score 5.3medium
Affected software
Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
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 a system API endpoint. Authenticated users could retrieve sensitive information such as license details and the installed software version without proper authorization checks. The vulnerability is fixed in versions 4.9.0 and 5.4.0.
Potential Impact
The vulnerability leaks license information and the installed version number to authenticated users. While this does not directly allow privilege escalation or remote code execution, disclosure of such information could aid attackers in reconnaissance or targeted attacks. No known exploits are reported in the wild.
Mitigation Recommendations
Upgrade Kirby CMS to version 4.9.0 or later, or 5.4.0 or later, where this authorization issue has been fixed. Since the vendor advisory indicates the issue is patched in these versions, applying the official update is the recommended remediation. Patch status is confirmed 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: 05/10/2026, 01:38:55 UTC
Last enriched: 05/17/2026, 10:45:47 UTC
Last updated: 07/02/2026, 20:51:20 UTC
Views: 81
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.