CVE-2026-54003
Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header
- State
- Published
- Severity
- 9.1 Critical
- Published
- Jul 9, 2026
- Updated
- Jul 9, 2026
- Reserved
- Jun 11, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.1 Critical | 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 | GitHub_M |
Weaknesses
- CWE-454 External Initialization of Trusted Variables or Data Stores
Affected Products
| Product | Versions |
|---|---|
kirbygetkirby |
|
References
- https://github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv
- https://github.com/getkirby/kirby/pull/8166
- https://github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d
- https://github.com/getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234
- https://github.com/getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15b
- https://github.com/getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3a
- https://github.com/getkirby/kirby/releases/tag/4.9.4
- https://github.com/getkirby/kirby/releases/tag/5.4.4
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