CVE-2026-84318Public exploitNetwork attack vectorHinoki check available

Authenticated code execution via unchecked MCP directives

Published Oct 12, 2026 · Updated Oct 12, 2026

Directive injection in Nginx UI before 2.4.1 allows remote authenticated users to execute code via MCP configuration creation. The nginx_config_add tool writes attacker-supplied configuration and reloads Nginx without calling config.ValidateConfigFile, allowing blocked directives through. Affected versions start at 2.0.0-rc.6; exploitation requires a valid JWT or node-secret token, and code execution requires a loaded Perl, njs, or Lua module.

CVSS severity8.8
High
EPSS probability0.62%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Directive injection in Nginx UI before 2.4.1 allows remote authenticated users to execute code via MCP configuration creation. The nginx_config_add tool writes attacker-supplied configuration and reloads Nginx without calling config.ValidateConfigFile, allowing blocked directives through. Affected versions start at 2.0.0-rc.6; exploitation requires a valid JWT or node-secret token, and code execution requires a loaded Perl, njs, or Lua module.

The record

CVE
CVE-2026-84318
Published
Oct 12, 2026
Updated
Oct 12, 2026
Vendor
0xJacky
Product
Nginx UI
Classifications
CWE-693, T1068
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=>= 2.0.0-rc.6, < 2.4.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

0xJacky · Nginx UIversion=>= 2.0.0-rc.6, < 2.4.1

Published CVSS scores

8.80xJackyCVSS: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-693Protection Mechanism Failure
T1068Exploitation for Privilege Escalation

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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