CVE-2026-61630 nginx ignition has TOTP Reuse During Validity Window
Attackers can reuse TOTP codes within the validity window to bypass two-factor authentication in nginx ignition.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-61630?
CVE-2026-61630 is a medium-severity authentication bypass vulnerability in lucasdillmann nginx-ignition, published on 21 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
nginx ignition is a user interface for the nginx web server. In versions 2.33.0 through 2.35.0, any user that has enabled the OTP 2FA can have their TOTP reused during the standard 30 second validity window. Version 2.35.1 patches the issue.
Weakness: CWE-287
Which versions are affected by CVE-2026-61630?
3 open source packages ship an affected version, including github.com/lucasdillmann/nginx-ignition.
| Package | Affected | Fixed in |
|---|---|---|
github.com/lucasdillmann/nginx-ignition Go | From 0.0.0-20260217145239-1cbfae0296f1 | 0.0.0-20260328015550-8d35e1eb5dd6 |
github.com/lucasdillmann/nginx-ignition Go | From 0.0.0-20260217145239-1cbfae0296f1 | 0.0.0-20260328015550-8d35e1eb5dd6 |
github.com/lucasdillmann/nginx-ignition Go | From 0.0.0-20260217145239-1cbfae0296f1 | 0.0.0-20260328015550-8d35e1eb5dd6 |
How do I fix CVE-2026-61630?
Upgrade github.com/lucasdillmann/nginx-ignition to 0.0.0-20260328015550-8d35e1eb5dd6 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-61630 being exploited?
There is no known exploitation of CVE-2026-61630 in the wild and no public exploit code.
Sources
Also known as GHSA-hf33-q6cf-c66f, GO-2026-6537.