GHSA-hf33-q6cf-c66fPublished

nginx ignition has TOTP Reuse During Validity Window

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-61630

Published

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.

Source published: 21 Sep 2026 14:17:11 UTC
Source modified: 21 Sep 2026 20:46:12 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 4.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

euvd · EUVD-2026-83922

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Sep 21, 2026, 2:17:11 PM

dateUpdated: Sep 21, 2026, 8:46:12 PM

Source published: Sep 21, 2026, 2:17:11 PM (timezone not stated)
Source modified: Sep 21, 2026, 8:46:12 PM (timezone not stated)
Observed here: 11 Nov 2026 15:02:51 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 4.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

nvd · CVE-2026-61630

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Deferred

Weakness classifications: CWE-287

Original publisher date fields

published: 2026-09-21T15:17:30.650

lastModified: 2026-09-24T21:25:27.050

Source published: 21 Sep 2026 15:17:30 UTC
Source modified: 24 Sep 2026 21:25:27 UTC
Observed here: 25 Oct 2026 14:19:22 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 4.2 CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

osv · GHSA-hf33-q6cf-c66f

Published

### Summary Any user that has enabled the OTP 2FA can have their TOTP reused during the standard 30 second validity window. ### Details The https://github.com/pquerna/otp package [doesn't include](https://github.com/pquerna/otp/issues/61) checking for already used TOTPs within its the validity window. This requires each application that uses the package to implement their own method of tracking and verifying that codes can't be reused. Section 6.5.1 within the [Authentication](https://github.com/OWASP/ASVS/blob/master/5.0/en/0x15-V6-Authentication.md) section of the OWASP ASVS recommends multiple checks, some of which involving TOTPs: > Verify that lookup secrets, out-of-band authentication requests or codes, and time-based one-time passwords (TOTPs) are only successfully usable once. The OWASP WSTG also references this as one of their [checks](https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/04-Authentication_Testing/11-Testing_Multi-Factor_Authentication) to look for: > Can the OTPs be used more than once? ### PoC https://github.com/user-attachments/assets/86a43374-39bf-4d61-8f6d-5cc440c99a1e ### Impact Any user who uses 2FA could be impacted if their traffic is able to be captured, they're phished/social engineered, or other methods of attack. This disrupts one layer of the defense-in-depth model surrounding 2FA. ### Similar CVEs - [CVE-2025-6014](https://nvd.nist.gov/vuln/detail/CVE-2025-6014) - [CVE-2025-55003](https://nvd.nist.gov/vuln/detail/CVE-2025-55003) - [CVE-2026-33473](https://github.com/go-vikunja/vikunja/security/advisories/GHSA-p747-qc5p-773r) ### Remediation Store a deny-list of TOTP codes for their validity windows and check submitted codes against it to ensure none are being reused. After their validity window has closed, the 2FA code can be removed from the list.

Source published: 21 Sep 2026 21:47:40 UTC
Source modified: 28 Sep 2026 17:11:17 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:N/A:N

Publisher rating · MODERATE

osv · GO-2026-6537

Published

nginx ignition has TOTP Reuse During Validity Window in github.com/lucasdillmann/nginx-ignition

Source published: 28 Sep 2026 16:43:40 UTC
Source modified: 28 Sep 2026 17:00:25 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.