{"id":"CVE-2026-42222","aliases":["GHSA-mxqh-q9h6-v8pq","GO-2026-5521"],"url":"https://o3.security/vulnerability/CVE-2026-42222","summary":"nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover","details":"Nginx UI is a web user interface for the Nginx web server. In version 2.3.5, an unauthenticated bootstrap takeover exists in nginx-ui during the initial installation window exposed by POST /api/install. At time of publication no public patches are available.","published":"2026-05-04T20:11:11.049Z","modified":"2026-07-31T18:30:07.819499085Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/0xJacky/nginx-ui","fixedVersion":null}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-mxqh-q9h6-v8pq"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42222.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42222"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-31T18:30:07.819499085Z"}}