{"id":"CVE-2026-54003","state":"PUBLISHED","title":"Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header","description":"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.","publishedAt":"2026-07-09T18:36:43.667Z","updatedAt":"2026-07-09T19:23:24.078Z","severity":{"score":9.1,"label":"Critical","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["getkirby kirby"],"affected":[{"vendor":"getkirby","product":"kirby","versions":[{"version":"< 4.9.4","status":"affected"},{"version":">= 5.0.0, < 5.4.4","status":"affected"}]}],"references":["https://github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv","https://github.com/getkirby/kirby/pull/8166","https://github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d","https://github.com/getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234","https://github.com/getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15b","https://github.com/getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3a","https://github.com/getkirby/kirby/releases/tag/4.9.4","https://github.com/getkirby/kirby/releases/tag/5.4.4"],"weaknesses":["CWE-454"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54003.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54003","state":"PUBLISHED","datePublished":"2026-07-09T18:36:43.667Z","dateUpdated":"2026-07-09T19:23:24.078Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-11T16:34:11.635Z"},"containers":{"cna":{"title":"Kirby: External Initialization of the Panel on reverse proxy setups with the `Forwarded` header","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"getkirby","product":"kirby","versions":[{"version":"< 4.9.4","status":"affected"},{"version":">= 5.0.0, < 5.4.4","status":"affected"}]}],"references":[{"url":"https://github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv","name":"https://github.com/getkirby/kirby/security/advisories/GHSA-whxw-24jc-cwmv","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/getkirby/kirby/pull/8166","name":"https://github.com/getkirby/kirby/pull/8166","tags":["x_refsource_MISC"]},{"url":"https://github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d","name":"https://github.com/getkirby/kirby/commit/1c7fee90e49153cf9ca4a6ec17481d25fbedc48d","tags":["x_refsource_MISC"]},{"url":"https://github.com/getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234","name":"https://github.com/getkirby/kirby/commit/3423f66c01dbc0455862e23ee699d2aa469f3234","tags":["x_refsource_MISC"]},{"url":"https://github.com/getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15b","name":"https://github.com/getkirby/kirby/commit/66a3a14bf0892d320723ba766cd5f1d33a51d15b","tags":["x_refsource_MISC"]},{"url":"https://github.com/getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3a","name":"https://github.com/getkirby/kirby/commit/ab992dc149610b90e337c2955ab6ccb7f72ffb3a","tags":["x_refsource_MISC"]},{"url":"https://github.com/getkirby/kirby/releases/tag/4.9.4","name":"https://github.com/getkirby/kirby/releases/tag/4.9.4","tags":["x_refsource_MISC"]},{"url":"https://github.com/getkirby/kirby/releases/tag/5.4.4","name":"https://github.com/getkirby/kirby/releases/tag/5.4.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-454","lang":"en","description":"CWE-454: External Initialization of Trusted Variables or Data Stores","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-09T18:36:43.667Z"},"source":{"advisory":"GHSA-whxw-24jc-cwmv","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-09T19:23:16.615569Z","id":"CVE-2026-54003","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-09T19:23:24.078Z"}}]}}}