Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-whxw-24jc-cwmv

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

CVSS 9.1 CriticalCriticalEPSS 0.0074 · 54th percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 18 Jun 2026, 15:04 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
getkirby/cmsPackagist<4.9.4 || >=5.0.0-alpha.1, <5.4.44.9.4, 5.4.4
Identifiers
GHSA-whxw-24jc-cwmv · CVE-2026-54003 · PKSA-h8zr-vfb5-1d5r
Weakness (CWE)
CWE-454
Tags
Published
18 Jun 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Kirby CMS (Packagist getkirby/cms) versions before 4.9.4, and from 5.0.0-alpha.1 up to but not including 5.4.4, are affected. Sites with no configured user accounts that run behind a reverse proxy setting the Forwarded for=, X-Client-IP, or X-Real-IP header could have the Panel installed, creating an admin account, by a request from a remote IP address without authentication. Upgrade to Kirby 4.9.4 or 5.4.4, or a later version; for older Kirby 3 sites, create the initial admin account yourself or disable the REST API.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.1 Critical 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 CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0074, the 54th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:00 UTC First seen by agentprime
  2. 31 Oct 2026, 14:00 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.