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

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Summary

CVECVE-2026-54003
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-09 19:17:06 UTC
Updated2026-07-10 15:49:19 UTC
DescriptionKirby 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.

Risk And Classification

Primary CVSS: v4.0 9.1 CRITICAL from [email protected]

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS: 0.005450000 probability, percentile 0.418900000 (date 2026-07-11)

Problem Types: CWE-454 | CWE-454 CWE-454: External Initialization of Trusted Variables or Data Stores

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary9.1CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED9.1CRITICALCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
None
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Getkirby Kirby affected < 4.9.4 Not specified
CNA Getkirby Kirby affected >= 5.0.0, < 5.4.4 Not specified

References

ReferenceSourceLinkTags
github.com/getkirby/kirby/releases/tag/4.9.4 [email protected] github.com
github.com/getkirby/kirby/pull/8166 [email protected] github.com
github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv [email protected] github.com
github.com/getkirby/kirby/releases/tag/5.4.4 [email protected] github.com
github.com/getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234 [email protected] github.com
github.com/getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15b [email protected] github.com
github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d [email protected] github.com
github.com/getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3a [email protected] github.com
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