CVE-2026-61630Public exploitNetwork attack vectorHinoki check available

Account access via reusable TOTP codes

Published Sep 21, 2026 · Updated Sep 21, 2026

Improper authentication in nginx ignition 2.33.0 through 2.35.0 allows remote authenticated users to reuse a captured TOTP. The authentication service validates a time-based code but does not record or reject that code after successful use, so a second request within the 30-second window is accepted. Exploitation requires an OTP-enabled account, its password, and a captured or phished current code; replay grants another session with that account's access.

CVSS severity4.2
Medium
EPSS probability0.38%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Improper authentication in nginx ignition 2.33.0 through 2.35.0 allows remote authenticated users to reuse a captured TOTP. The authentication service validates a time-based code but does not record or reject that code after successful use, so a second request within the 30-second window is accepted. Exploitation requires an OTP-enabled account, its password, and a captured or phished current code; replay grants another session with that account's access.

The record

CVE
CVE-2026-61630
Published
Sep 21, 2026
Updated
Sep 21, 2026
Vendor
Lucas Dillmann
Product
nginx ignition
Classifications
CWE-287, T1556.006
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.33.0, < 2.35.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Lucas Dillmann · nginx ignitionversion=>= 2.33.0, < 2.35.1

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1556.006Modify Authentication Process: Multi-Factor Authentication

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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