# CVE-2026-54003

## Summary

- **CVE ID:** CVE-2026-54003
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (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)
- **CWE:** CWE-454
- **Published:** Jul 9, 2026
- **Last Modified:** Jul 10, 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.

## Affected Products

- getkirby — kirby (< 4.9.4)
- getkirby — kirby (>= 5.0.0, < 5.4.4)

## References

- [CNA](https://github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv)
- [CNA](https://github.com/getkirby/kirby/pull/8166)
- [CNA](https://github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d)
- [CNA](https://github.com/getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234)
- [CNA](https://github.com/getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15b)
- [CNA](https://github.com/getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3a)
- [CNA](https://github.com/getkirby/kirby/releases/tag/4.9.4)
- [CNA](https://github.com/getkirby/kirby/releases/tag/5.4.4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.74%
- **EPSS Percentile:** 52.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._