{"id":"CVE-2026-61628","published":"2026-09-21T15:17:30.290","lastModified":"2026-09-21T15:17:30.290","description":"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.","cvssScore":8.1,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwes":["CWE-362"],"vendors":[],"products":[],"references":[{"url":"https://github.com/lucasdillmann/nginx-ignition/commit/0586b4e55ab780676d3553a2592979dfa2fb0183","tags":[]},{"url":"https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5","tags":[]},{"url":"https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5","tags":[]}],"exploitRefs":[{"url":"https://github.com/lucasdillmann/nginx-ignition/commit/0586b4e55ab780676d3553a2592979dfa2fb0183","tags":[]},{"url":"https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5","tags":[]},{"url":"https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows unauthenticated attackers to create a full admin account by exploiting a race condition in the onboarding process.","exploitability":"Exploitation requires reaching an instance in its pre-onboarding state and making concurrent POST requests, which is moderately difficult.","blast_radius":"If exploited, this could grant full administrative control to attackers, leading to severe data breaches or system compromise.","remediation":"Update to nginx ignition version 2.41.1 or later to patch the vulnerability.","tags":["auth-bypass","web","race-condition","admin-rights"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-22T06:07:34.930Z"}}