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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.

PUBLISHED Reserved 2026-06-03 | Published 2026-07-09 | Updated 2026-07-09 | Assigner GitHub_M




MEDIUM: 6.9CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N

Problem types

CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')

CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')

Product status

< 4.9.4
affected

>= 5.0.0, < 5.4.4
affected

References

github.com/.../kirby/security/advisories/GHSA-4v4h-m2qq-ppgw

github.com/...ommit/aa33414e1669e866cdd6f4decfae2a669e8bb828

github.com/...ommit/fad9cbd22c73ed0fbd3aaf62310a8dcacfc007cd

github.com/getkirby/kirby/releases/tag/4.9.4

github.com/getkirby/kirby/releases/tag/5.4.4

cve.org (CVE-2026-50188)

nvd.nist.gov (CVE-2026-50188)

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