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CVE-2026-54003

40
FAUCET Score

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.

First published: Jul 9, 2026Last modified: Jul 9, 2026

Impacted Technologies

VendorProductVersion(s)CPE
GetkirbyKirby
< 4.9.4, >= 5.0.0, < 5.4.4CNA affected

CVSS Data

CVSS version used by this source: 4.0

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.55%
Probability of exploitation in next 30 days
EPSS Percentile
42.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0054 is in the 22nd percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: getkirby/cmsFixed in: 4.9.4
composerpatch availablevia ghsa
Product: getkirby/cmsFixed in: 5.4.4

Vendor Advisories (1)

composerGHSA-whxw-24jc-cwmvcritical

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

Jun 18, 2026

References

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/pull/8166
github.com / getkirby/kirby/releases/tag/4.9.4
github.com / getkirby/kirby/releases/tag/5.4.4
github.com / getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv