Critical severityNVD Advisory· Published Jul 9, 2026· Updated Jul 10, 2026
CVE-2026-54003
CVE-2026-54003
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
getkirby/cmsPackagist | < 4.9.4 | 4.9.4 |
getkirby/cmsPackagist | >= 5.0.0-alpha.1, < 5.4.4 | 5.4.4 |
Affected products
1Patches
Vulnerability mechanics
References
9- github.com/advisories/GHSA-whxw-24jc-cwmvghsaADVISORY
- github.com/getkirby/kirby/releases/tag/4.9.4nvdWEB
- github.com/getkirby/kirby/releases/tag/5.4.4nvdWEB
- github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmvnvdWEB
- github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48dnvd
- github.com/getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234nvd
- github.com/getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15bnvd
- github.com/getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3anvd
- github.com/getkirby/kirby/pull/8166nvd
News mentions
1- Kirby CMS: Seven Bugs Patched in One Advisory, Including Critical Auth BypassVypr Intelligence · Jun 18, 2026