{"id":"CVE-2026-61628","published":"2026-09-21T15:17:30.290","lastModified":"2026-09-23T18:25:00.707","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 a remote unauthenticated attacker to create a full admin account by exploiting a race condition in the onboarding process of nginx ignition.","exploitability":"Exploitation is moderately hard due to the need for timing and concurrency, and the attacker must be able to reach the pre-onboarding state of the target.","blast_radius":"If exploited, the attacker gains full admin access, which could lead to complete compromise of the system and data.","remediation":"Upgrade to version 2.41.1 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["auth-bypass","web","race-condition"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-03T09:06:08.712Z"}}