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CVE-2026-50188— Kirby: Request header injection in `Http\Remote`

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.

getkirby Kirby是getkirby个人开发者开源的一套基于文件的内容管理系统。 getkirby kirby 4.9.4之前版本和5.4.4之前版本存在输入验证错误漏洞，该漏洞源于使用Kirby Http Remote类发送包含不可信数据的标头选项的发出HTTP请求时，标头值中的换行符可能将单独的意外请求标头注入远程服务。

AI Predicted 5.3 Difficulty: Easy EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 2

VendorProduct Version RangeStatus
getkirby kirby < 4.9.4 affected
>= 5.0.0, < 5.4.4 affected
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I. Basic Information for CVE-2026-50188

Vulnerability Information
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Vulnerability Title
Kirby: Request header injection in `Http\Remote`
Source: CVE Program / CVE List V5
Vulnerability Description
Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites and plugins using the Kirby Http Remote class, including Remote::request(), Remote::get(), and Remote::post(), to send outgoing HTTP requests with untrusted data in the headers option could allow newline characters in a header value to inject a separate unintended request header to the remote service. This issue is fixed in versions 4.9.4 and 5.4.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
getkirby kirby 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
getkirby Kirby是getkirby个人开发者开源的一套基于文件的内容管理系统。 getkirby kirby 4.9.4之前版本和5.4.4之前版本存在输入验证错误漏洞，该漏洞源于使用Kirby Http Remote类发送包含不可信数据的标头选项的发出HTTP请求时，标头值中的换行符可能将单独的意外请求标头注入远程服务。
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 < 4.9.4 -

II. Public POCs for CVE-2026-50188

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III. Intelligence Information for CVE-2026-50188

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Patches & Fixes for CVE-2026-50188 (2)

Vendor Advisories for CVE-2026-50188 (1)

Vendor Pages for CVE-2026-50188 (2)

Same Patch Batch · getkirby · 2026-07-09 · 7 CVEs total

CVE-2026-54004 Kirby: Access to files of top-level drafts is not protected by permissions
CVE-2026-54005 Kirby: `pages.access` permission is not checked in the `site/find` REST API route
CVE-2026-54003 Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` h
CVE-2026-54002 Kirby: Cross-site scripting (XSS) from incomplete HTML/XML sanitization in `Dom::sanitize(
CVE-2026-49276 Kirby: Self cross-site scripting (self-XSS) in the writer field
CVE-2026-49274 Kirby: `pages.access` permission is not checked in the pages picker for parent pages

IV. Related Vulnerabilities

Same product: kirby
Same vendor: getkirby
Same weakness: CWE-93

V. Comments for CVE-2026-50188

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