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CVE-2026-42051— Kirby: System API endpoint leaks license data and installed version to authenticated users

Quick assessment

Affected
getkirby kirby
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Kirby是Kirby开源的一套基于文件的内容管理系统（CMS）。 Kirby 4.9.0之前版本和5.4.0之前版本存在安全漏洞，该漏洞源于系统API端点泄露许可证数据和已安装版本给已认证用户。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 2

VendorProduct Version RangeStatus
getkirby kirby < 4.9.0 affected
>= 5.0.0, < 5.4.0 affected
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I. Basic Information for CVE-2026-42051

Vulnerability Information
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Vulnerability Title
Kirby: System API endpoint leaks license data and installed version to authenticated users
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Kirby 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kirby是Kirby开源的一套基于文件的内容管理系统（CMS）。 Kirby 4.9.0之前版本和5.4.0之前版本存在安全漏洞，该漏洞源于系统API端点泄露许可证数据和已安装版本给已认证用户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
getkirby kirby < 4.9.0 -

II. Public POCs for CVE-2026-42051

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III. Intelligence Information for CVE-2026-42051

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Vendor Advisories for CVE-2026-42051 (1)

Vendor Pages for CVE-2026-42051 (1)

Same Patch Batch · getkirby · 2026-05-09 · 4 CVEs total

CVE-2026-42069 Kirby: Read access to site, user and role information is not gated by permissions
CVE-2026-42137 Kirby: `pages.access/list` and `files.access/list` permissions are not consistently checke
CVE-2026-42174 Kirby: User avatar creation, replacement and deletion are not gated by user update permiss

IV. Related Vulnerabilities

Same product: kirby
Same vendor: getkirby
Same weakness: CWE-862

V. Comments for CVE-2026-42051

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