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CVE

CVE-2026-54003

Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header
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CVE

CVE-2026-54003

Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
4.0
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
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/getkirby/kirby/releases/tag/4.9.4, https://github.com/getkirby/kirby/releases/tag/5.4.4, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54003.json, https://github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv, https://nvd.nist.gov/vuln/detail/CVE-2026-54003, 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/pull/8166

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00743%
EPSS Percentile
0.52963%
Introduced Version
2ff182ba39ddea19fa1615bd3733f734b5e53842
Fix Available
ab992dc149610b90e337c2955ab6ccb7f72ffb3a

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