CVE-2026-50188: Getkirby Kirby

Medium severity, CVSS 6.9. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Getkirby Kirby: before 4.9.4 (fixed in 4.9.4); from 5.0.0, before 5.4.4 (fixed in 5.4.4)

Published 2026-07-09. Last modified 2026-07-10.