CVE-2026-33032— Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
Quick assessment
Affected
0xJacky nginx-ui
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Nginx UI是Jacky个人开发者的一个 Nginx 的 WebUI。 Nginx UI 2.3.5及之前版本存在安全漏洞，该漏洞源于MCP集成中/mcp_message端点仅应用IP白名单且默认白名单为空，允许任何网络攻击者未经身份验证调用所有MCP工具，可能导致完全接管nginx服务。
Public Exploits 1
Nuclei · 1
CVE-2026-33032.yaml [template]
Possible ATT&CK Techniques 3 AI
T1562 T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-33032
Vulnerability Information
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Vulnerability Title
Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
Source: CVE Program / CVE List V5
Vulnerability Description
Nginx UI is a web user interface for the Nginx web server. In versions 2.3.5 and prior, the nginx-ui MCP (Model Context Protocol) integration exposes two HTTP endpoints: /mcp and /mcp_message. While /mcp requires both IP whitelisting and authentication (AuthRequired() middleware), the /mcp_message endpoint only applies IP whitelisting - and the default IP whitelist is empty, which the middleware treats as "allow all". This means any network attacker can invoke all MCP tools without authentication, including restarting nginx, creating/modifying/deleting nginx configuration files, and triggering automatic config reloads - achieving complete nginx service takeover. At time of publication, there are no publicly available patches.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Nginx UI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nginx UI是Jacky个人开发者的一个 Nginx 的 WebUI。 Nginx UI 2.3.5及之前版本存在安全漏洞，该漏洞源于MCP集成中/mcp_message端点仅应用IP白名单且默认白名单为空，允许任何网络攻击者未经身份验证调用所有MCP工具，可能导致完全接管nginx服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Shenlong Deep Dive — AI Deep Analysis
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Affected Products
II. Public POCs for CVE-2026-33032
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | Network attackers can fully control nginx service, including config modification and service restart, leading to complete service takeover. | https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-33032.yaml | POC Details |
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Same Patch Batch · 0xJacky · 2026-03-30 · 6 CVEs total
| CVE-2026-33030 | 8.8 HIGH | Nginx UI: Unencrypted Storage of DNS API Tokens and ACME Private Keys |
| CVE-2026-33028 | Nginx UI: Race Condition Leads to Persistent Data Corruption and Service Collapse | |
| CVE-2026-33029 | Nginx UI: DoS via Negative Integer Input in Logrotate Interval | |
| CVE-2026-33026 | nginx-ui Backup Restore Allows Tampering with Encrypted Backups | |
| CVE-2026-33027 | Nginx UI: Improper Path Validation Allows Recursive Deletion of the Nginx Configuration Di |
IV. Related Vulnerabilities
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Same vendor: 0xJacky
-
CVE-2026-84312
Nginx UI: Casdoor SSO callback uses a constant `state` param -
CVE-2026-84360
Nginx UI: OTP secure-session step-up can be bypassed via MCP -
CVE-2026-84316
Nginx UI: nginx config directive denylist (ValidateConfigFil -
CVE-2026-84319
Nginx UI: MCP configuration tools bypass restricted directiv -
CVE-2026-84317
Nginx UI: MCP nginx_config_add skips config directive valida
Same weakness: CWE-306
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V. Comments for CVE-2026-33032
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