{"id":"CVE-2026-61628","summary":"nginx ignition has Unauthenticated Admin Account Creation via Onboarding Race Condition","details":"nginx ignition is a user interface for the nginx web server. Prior to version 2.41.1, `POST /api/users/onboarding/finish` is registered as anonymous (unauthenticated) and creates a user with full ReadWrite admin permissions. Because the handler uses a check-then-act (TOCTOU) pattern between the \"onboarding already completed?\" check and the user-creation write, with no atomic guard, a remote unauthenticated attacker who can reach an instance in its pre-onboarding state can create an administrator account for themselves — and concurrent requests can create multiple admin accounts in a single race. Version 2.41.1 patches the issue.","aliases":["GHSA-pxcx-fv34-x9p5"],"modified":"2026-09-23T03:45:56.699227467Z","published":"2026-09-21T14:44:54.985Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61628.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-362"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61628.json"},{"type":"ADVISORY","url":"https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61628"},{"type":"FIX","url":"https://github.com/lucasdillmann/nginx-ignition/commit/0586b4e55ab780676d3553a2592979dfa2fb0183"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/lucasdillmann/nginx-ignition","events":[{"introduced":"0"},{"fixed":"0586b4e55ab780676d3553a2592979dfa2fb0183"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.41.1"}]}}],"versions":["2.41.0","2.40.1","2.40.0","2.39.0","2.38.0","2.37.0","2.36.1","2.36.0","2.35.3","2.35.2","2.35.1","2.35.0","2.34.0","2.33.0","2.32.0","2.31.2","2.31.1","2.31.0","2.30.0","2.29.1","2.29.0","2.28.0","2.27.1","2.27.0","2.26.0","2.25.1","2.25.0","2.24.0","2.23.0","2.22.0","2.21.0","2.20.2","2.20.1","2.20.0","2.19.0","2.18.1","2.18.0","2.17.1","2.17.0","2.16.0","2.15.1","2.14.0","2.13.1","2.13.0","2.12.0","2.11.1","2.11.0","2.10.1","2.10.0","2.9.1","2.9.0","2.8.0","2.7.0","2.6.0","2.5.0","2.4.2","2.4.1","2.4.0","2.3.1","2.3.0","2.2.0","2.1.1","2.1.0","2.0.2","2.0.1","2.0.0","1.7.1","1.7.0","1.6.0","1.5.1","1.5.0","1.4.0","1.3.0","1.2.0","1.1.0","1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61628.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}