{"id":"CVE-2026-42221","revision":"abde3112fc2146f4af7bed76a1ba179a","records":[{"revision":"abde3112fc2146f4af7bed76a1ba179a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-42221","aliases":[],"title":"nginx-ui: Unauthenticated First-Run Installer Allows Remote Initial Admin Claim","description":"Nginx UI is a web user interface for the Nginx web server. From version 2.0.0 to before version 2.3.8, an unauthenticated network attacker can claim the initial administrator account on a fresh nginx-ui instance during the first-run setup window. The public /api/install endpoint is reachable without authentication, and the request-encryption flow only protects payload confidentiality in transit; it does not authenticate who is allowed to perform installation. A remote attacker who reaches the service before the legitimate operator can set the admin email, username, and password, causing permanent initial-instance takeover. This issue has been patched in version 2.3.8.","state":0,"publishedAt":"2026-05-04T20:09:37.308+00:00","modifiedAt":"2026-05-05T14:14:11.906+00:00","affected":[{"ecosystem":"Vendor product","name":"nginx-ui","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"0xJacky\",\n                    \"product\": \"nginx-ui\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 2.0.0, < 2.3.8\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1,"severity":"HIGH"}],"references":["https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h27v-ph7w-m9fp","https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-42221","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-42221","identifiers":["CVE-2026-42221"]},"retained":false,"historicalAffected":[]}],"coverage":[]}