nginx ignition has Unauthenticated Admin Account Creation via Onboarding Race Condition
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.1epss 0.4%
from disclosure to weapon1 days
Published on NVDSep 21
1st PoC+1d
exploitation probability
0.4%top 71% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products
lucasdillmann · nginx-ignitionpublic PoCs found — 1
githubgithub.com/abraxas/CVE-2026-61628★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.