CVE-2026-21896— Kirby is missing permission checks in the content changes API
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 5.0.0版本至5.2.1版本存在安全漏洞，该漏洞源于内容更改API缺少权限检查，可能导致未经授权的修改。
Possible ATT&CK Techniques 2 AI
T1098 · Account Manipulation T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2026-21896
Vulnerability Information
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Vulnerability Title
Kirby is missing permission checks in the content changes API
Source: CVE Program / CVE List V5
Vulnerability Description
Kirby is an open-source content management system. From versions 5.0.0 to 5.2.1, Kirby is missing permission checks in the content changes API. This vulnerability affects all Kirby sites where user permissions are configured to prevent specific role(s) from performing write actions, specifically by disabling the update permission with the intent to prevent modifications to site content. This vulnerability does not affect those who have not altered the deviated from default user permissions. This issue has been patched in version 5.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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 5.0.0版本至5.2.1版本存在安全漏洞，该漏洞源于内容更改API缺少权限检查，可能导致未经授权的修改。
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
II. Public POCs for CVE-2026-21896
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-21896 (1)
IV. Related Vulnerabilities
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Same vendor: getkirby
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V. Comments for CVE-2026-21896
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