---
cve: "CVE-2026-54003"
severity: "CRITICAL"
cvss: 9.1
epss: "55%"
vendor: "getkirby"
kev: false
exploited: false
published: "2026-07-09 19:17:06"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-12T07:34:34+02:00"
---

# CVE-2026-54003

> 9.1 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 274dca6df93de6eda649f27f5367ddbc8e0f1fe1 (Commit)
- 3f96d3b9ccda22f0d2f901b96376b5d08556ad75 (Commit)

## Referenzen

- <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>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-54003) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_