CVE-2026-54003
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.
Scoring
- Severity
- CRITICAL
- CVSS base score
- 9.1
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- EPSS probability
- 0.74%
- CWE
- CWE-454
- Published
- 2026-07-09
- Last modified
- 2026-07-10
Affected products
- getkirby kirby
- getkirby kirby
Weakness type
Related vulnerabilities
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- CVE-2026-26148 — Microsoft Azure AD SSH Login extension for Linux Elevation of Privilege Vulnerability
- CVE-2025-36244 — IBM AIX privilege escalation