{"id":"EUVD-2026-27135","revision":"77cb633df2b64a7d9521d4b11a1350eb","records":[{"revision":"77cb633df2b64a7d9521d4b11a1350eb","observedAt":"2026-11-01T07:12:11.849+00:00","statement":{"source":"euvd","id":"EUVD-2026-27135","aliases":["CVE-2026-42221"],"title":"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 w…","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":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD 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":null}],"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://euvd.enisa.europa.eu/vulnerability/EUVD-2026-27135","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 4, 2026, 8:09:37 PM","dateUpdated":"May 5, 2026, 2:14:11 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-27135","identifiers":["EUVD-2026-27135","CVE-2026-42221"]},"retained":false,"historicalAffected":[]}],"coverage":[]}