CVE-2026-84319Public exploitNetwork attack vectorHinoki check available

Authenticated NJS execution via unchecked MCP configuration

Published Oct 12, 2026 · Updated Oct 12, 2026

Validation bypass in 0xJacky Nginx UI before 2.4.1 allows remote authenticated users to execute NJS via MCP configuration writes. The nginx_config_add tool writes untrusted configuration and reloads Nginx without enforcing the restricted-directive checks used by the HTTP API. Exploitation requires a secondary authenticated account, enabled MCP, and available NJS; execution occurs inside the Nginx worker context and does not itself execute OS commands.

CVSS severity8.3
High
EPSS probability0.28%
Next 30 days · Oct 20, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Validation bypass in 0xJacky Nginx UI before 2.4.1 allows remote authenticated users to execute NJS via MCP configuration writes. The nginx_config_add tool writes untrusted configuration and reloads Nginx without enforcing the restricted-directive checks used by the HTTP API. Exploitation requires a secondary authenticated account, enabled MCP, and available NJS; execution occurs inside the Nginx worker context and does not itself execute OS commands.

The record

CVE
CVE-2026-84319
Published
Oct 12, 2026
Updated
Oct 12, 2026
Vendor
0xJacky
Product
Nginx UI
Classifications
CWE-693, T1059.007
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

8.3GitHub_MCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/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-693Protection Mechanism Failure
T1059.007JavaScript

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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