CVE-2026-54003 json
Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header
published 4mo ago modified 17d ago also EUVD-2026-42666 , GHSA-whxw-24jc-cwmv
- cvss
- 9.1
- version 4.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 55%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist getkirby/cms 4.9.4, 5.4.4
- getkirby kirby 4.9.4, 5.4.4
- getkirby panel 4.9.4, 5.4.4
- github.com/getkirby/kirby@1c7fee9 commit
- github.com/getkirby/kirby@3423f66 commit
- github.com/getkirby/kirby@66a3a14 commit
- github.com/getkirby/kirby@ab992dc commit
- github.com/getkirby/kirby#8166 pull request
- github.com/getkirby/kirby/releases/tag/4.9.4 release
- github.com/getkirby/kirby/releases/tag/5.4.4 release
Is CVE-2026-54003 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
0.74% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.1 | 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 |
| CNA | 4.0 | 9.1 | 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 |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | getkirby/cms | <4.9.4 >=5.0.0-alpha.1, <5.4.4 |
4.9.4 5.4.4 |
Affected products
- getkirby kirby
Classification
- Weakness
-
- CWE-454 External Initialization of Trusted Variables or Data Stores
References
- github.com /getkirby/kirby/pull/8166
- github.com /getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d
- github.com /getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234
- github.com /getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15b
- github.com /getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3a
-
github.com
/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv
web
-
github.com
/getkirby/kirby/releases/tag/4.9.4
web
-
github.com
/getkirby/kirby/releases/tag/5.4.4
web
-
github.com
/getkirby/kirby
package
Sources
- CVE List CVE-2026-54003
- GitHub Advisory GHSA-whxw-24jc-cwmv
- NVD CVE-2026-54003
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.