CVE-2026-84313Public exploitNetwork attack vectorHinoki check available

Persistent account takeover via unchecked factor enrollment

Published Oct 12, 2026 · Updated Oct 12, 2026

Authentication flaws in Nginx UI before 2.4.1 allow remote authenticated users to retain account access through factor enrollment. POST /api/otp_enroll and POST /api/finish_passkey_register bypass RequireSecureSession and accept attacker-controlled authentication factors without checking the current password. A stolen JWT suffices; TOTP enrollment requires TOTP to be disabled, while passkey enrollment has no existing-enrollment guard, enabling access that survives password changes and interferes with legitimate authentication.

CVSS severity8.8
High
EPSS probability0.43%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authentication flaws in Nginx UI before 2.4.1 allow remote authenticated users to retain account access through factor enrollment. POST /api/otp_enroll and POST /api/finish_passkey_register bypass RequireSecureSession and accept attacker-controlled authentication factors without checking the current password. A stolen JWT suffices; TOTP enrollment requires TOTP to be disabled, while passkey enrollment has no existing-enrollment guard, enabling access that survives password changes and interferes with legitimate authentication.

The record

CVE
CVE-2026-84313
Published
Oct 12, 2026
Updated
Oct 12, 2026
Vendor
0xJacky
Product
Nginx UI
Classifications
CWE-306, CWE-287, T1098.005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 12, 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=< 2.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

0xJacky · Nginx UIversion=< 2.4.1

Published CVSS scores

8.8GitHub_MCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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-306Missing Authentication for Critical Function
CWE-287Improper Authentication
T1098.005Device Registration

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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