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CVE-2026-54003
Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header
Critical9.1EPSS 0.74%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | Critical9.1 | 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 |
| NVDNVD · Deferred | 4.0 | Critical9.1 | 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/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 (exploitation in 30 days)
- 0.74% · top 45% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.1.
Weakness
Affected products
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Packagistgetkirby/cmsGHSA-whxw-24jc-cwmv (opens in a new tab)
References (8)
- https://github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv (opens in a new tab)x_refsource_CONFIRM
- https://github.com/getkirby/kirby/pull/8166 (opens in a new tab)x_refsource_MISC
- https://github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d (opens in a new tab)x_refsource_MISC
- https://github.com/getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234 (opens in a new tab)x_refsource_MISC
- https://github.com/getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15b (opens in a new tab)x_refsource_MISC
- https://github.com/getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3a (opens in a new tab)x_refsource_MISC
- https://github.com/getkirby/kirby/releases/tag/4.9.4 (opens in a new tab)x_refsource_MISC
- https://github.com/getkirby/kirby/releases/tag/5.4.4 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-whxw-24jc-cwmv (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-54003)Record last updated .