CVE-2026-54003: 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 reve
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.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-54003
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-540030.55% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 42% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-54003 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Kirby is an
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- unknownCVE-2026-54005: Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites where…nvd · 2026-07-09
- unknownCVE-2026-54004: Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites with …nvd · 2026-07-09
- unknownCVE-2026-54002: Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites and p…nvd · 2026-07-09
- unknownCVE-2026-50188: Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites and p…nvd · 2026-07-09
- unknownCVE-2026-49276: Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites using…nvd · 2026-07-09
- unknownCVE-2026-49274: Kirby is an open-source content management system. Prior to 4.9.4 and 5.4.4, Kirby sites using…nvd · 2026-07-09
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