Paper/Archive/CVE-2026-54003

CVE-2026-54003

getkirby kirby — Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header

CVSS 9.1 (CNA)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 54.7.547 × 2010.9 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

kirby< 4.9.4–CNA

kirby>= 5.0.0, < 5.4.4–CNA

Scores by source

GitHub_M (CNA)9.1CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References