{"id":"CVE-2026-61628","title":"nginx ignition is a user interface for the nginx web server","summary":"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 …","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-362"],"vendor":"lucasdillmann","product":"nginx-ignition","affected":["nginx-ignition < 2.41.1"],"patched":["github.com/lucasdillmann/nginx-ignition 0.0.0-20260621194639-0586b4e55ab"],"published":"2026-09-21","updated":"2026-09-23","sourceUpdated":"2026-09-23T18:25:00.707","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61628","references":[{"url":"https://github.com/lucasdillmann/nginx-ignition/commit/0586b4e55ab780676d3553a2592979dfa2fb0183","label":"security-advisories@github.com"},{"url":"https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5","label":"security-advisories@github.com"},{"url":"https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61628"},{"url":"https://github.com/lucasdillmann/nginx-ignition/pull/131"},{"url":"https://github.com/lucasdillmann/nginx-ignition/releases/tag/2.41.1"},{"url":"https://github.com/advisories/GHSA-pxcx-fv34-x9p5"},{"url":"https://github.com/lucasdillmann/nginx-ignition"}],"tags":["nvd","exploit-available","cve.org","ghsa","go","osv"],"epss":0.00434,"epssPercentile":0.37544,"exploits":{"github":1,"githubRepos":["https://github.com/abraxas/CVE-2026-61628"],"checkedAt":"2026-10-27T19:06:06.474Z"},"exploitAvailable":true,"aliases":["GHSA-pxcx-fv34-x9p5","GO-2026-6540"],"ecosystem":"go","ingestedAt":"2026-09-21T15:19:25.700Z","slug":"CVE-2026-61628","body":"## Overview\n\nnginx 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-61628)\n\nAffected packages:\n\n- `github.com/lucasdillmann/nginx-ignition < 0.0.0-20260621194639-0586b4e55ab`\n\nPatched in:\n\n- `github.com/lucasdillmann/nginx-ignition 0.0.0-20260621194639-0586b4e55ab`\n\nSource: https://github.com/advisories/GHSA-pxcx-fv34-x9p5","depth":"midnight","depthScore":57,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":209512,"id":"CVE-2026-61628","ts":1790149169949,"field":"exploit_available","old":"false","new":"true"}]}