CVE-2026-54003 — Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header
Kirby is an open-source content management system. Prior to 4.9.4 and from 5.4.4, Kirby sites with no configured user accounts that run on publicly accessible servers behind a r…
Published: 2026-07-09 · CVSS: 9.1 · CVSS 4.0
Kirby is an open-source content management system. Prior to 4.9.4 and from 5.4.4, Kirby sites with no configured user accounts that run on publicly accessible servers behind a reverse proxy setting the Forwarded, X-Client-IP, or X-Real-IP request header could allow remote attackers to install the Panel and create the first admin user because local-IP checks trusted those headers incorrectly. This issue is fixed in versions 4.9.4 and 5.4.4.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7