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CVE-2026-54003

CRITICAL
9.1
CVSS 4.0
Description
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.

Metadata

CVE ID
CVE-2026-54003
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-06-11 16:34 UTC
Published
2026-07-09 18:36 UTC
Last updated
2026-07-09 19:23 UTC
Primary CWE
CWE-454
CWE-454: External Initialization of Trusted Variables or Dat…
Vendor / Product
getkirby / kirby
Sources
cve.org  ·  NVD

Severity & Metrics

9.1 CRITICAL CVSS 4.0
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
SSVC — CISA Coordinator
Exploitation
none
Automatable
yes
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
getkirby kirby — < 4.9.4, >= 5.0.0, < 5.4.4
Weakness (CWE)
CWESourceDescription
CWE-454 cna CWE-454: External Initialization of Trusted Variables or Data Stores
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.1 CRITICAL 4.0 cna 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
References (8)
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