{"action":"Upgrade getkirby/cms to 4.9.4 or later.","affected":[{"fixed":"4.9.4","introduced":"0"},{"fixed":"5.4.4","introduced":"5.0.0-alpha.1"}],"component":"getkirby/cms","cve_ids":["CVE-2026-54003"],"ecosystem":"Packagist","epss":0.00743,"exploited":false,"fixed_versions":["4.9.4","5.4.4"],"ghsa_id":"GHSA-whxw-24jc-cwmv","id":"tcs_01M5KFA4BJ3B31CY27XFGY03TB","modified_at":"2026-09-10T03:50:50.891258116Z","published_at":"2026-06-18T15:04:57Z","references":["https://osv.dev/vulnerability/GHSA-whxw-24jc-cwmv","https://github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv","https://github.com/getkirby/kirby","https://github.com/getkirby/kirby/releases/tag/4.9.4","https://github.com/getkirby/kirby/releases/tag/5.4.4"],"severity":{"label":"critical","score":9.1},"sources":[{"source":"osv","source_id":"GHSA-whxw-24jc-cwmv","url":"https://osv.dev/vulnerability/GHSA-whxw-24jc-cwmv"},{"source":"nvd","source_id":"CVE-2026-54003","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54003"}],"summary":"Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header"}