{"id":"CVE-2026-54003","aliases":["GHSA-whxw-24jc-cwmv"],"url":"https://o3.security/vulnerability/CVE-2026-54003","summary":"Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header","details":"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.","published":"2026-07-09T18:36:43.667Z","modified":"2026-08-12T03:51:36.227081270Z","cvss":null,"epss":{"score":0.00545,"percentile":0.43322,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"getkirby/cms","fixedVersion":"4.9.4"},{"ecosystem":"Packagist","name":"getkirby/cms","fixedVersion":"5.4.4"}],"fix":{"url":"https://github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d","label":"getkirby/kirby@1c7fee9"},"references":[{"type":"WEB","url":"https://github.com/getkirby/kirby/releases/tag/4.9.4"},{"type":"WEB","url":"https://github.com/getkirby/kirby/releases/tag/5.4.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54003.json"},{"type":"ADVISORY","url":"https://github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54003"},{"type":"FIX","url":"https://github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d"},{"type":"FIX","url":"https://github.com/getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234"},{"type":"FIX","url":"https://github.com/getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15b"},{"type":"FIX","url":"https://github.com/getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3a"},{"type":"FIX","url":"https://github.com/getkirby/kirby/pull/8166"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:36.227081270Z"}}