---
title: "CVE-2026-84360: Nginx UI - Broken Access Control"
description: "Nginx UI < 2.4.1 contains a broken access control caused by insufficient authentication on /mcp and /mcp_message routes, letting OTP-enabled users with normal JWT modify Nginx configuration and trigger reload, exploit bypasses step-up control."
url: https://panop.io/threat-heartbeat/CVE-2026-84360/
---

# CVE-2026-84360 Nginx UI - Broken Access Control

Nginx UI < 2.4.1 contains a broken access control caused by insufficient authentication on /mcp and /mcp\_message routes, letting OTP-enabled users with normal JWT modify Nginx configuration and trigger reload, exploit bypasses step-up control.

CVSS base score 8.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.35% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-84360)

## Details

Type

Broken Access Control

Impact

Broken Access Control, Denial Of Service

CVSS vector

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

Published

12 October 2026

Updated

15 October 2026

Weakness

[CWE-288](https://cwe.mitre.org/data/definitions/288.html)

## Vendor fix

Upgrade to version 2.4.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-84360](https://nvd.nist.gov/vuln/detail/CVE-2026-84360)
- [https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2](https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2)
- [https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1](https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1)
- [https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-vc32-4gwf-77xp](https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-vc32-4gwf-77xp)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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