CVE-2026-50188

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.

References

• https://github.com/getkirby/kirby/commit/aa33414e1669e866cdd6f4decfae2a669e8bb828
• https://github.com/getkirby/kirby/commit/fad9cbd22c73ed0fbd3aaf62310a8dcacfc007cd
• https://github.com/getkirby/kirby/releases/tag/4.9.4
• https://github.com/getkirby/kirby/releases/tag/5.4.4
• https://github.com/getkirby/kirby/security/advisories/GHSA-4v4h-m2qq-ppgw