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CVE-2026-33032— Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover

CVSS 9.8 · Critical EPSS 18.59% · P95
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
Source: NVD (National Vulnerability Database)
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)

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Affected Products

VendorProductAffected VersionsCPESubscribe
0xJackynginx-ui <= 2.3.5 -

II. Public POCs for CVE-2026-33032

#POC DescriptionSource LinkShenlong Link
1Network 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.yamlPOC Details
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III. Intelligence Information for CVE-2026-33032

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Same Patch Batch · 0xJacky · 2026-03-30 · 6 CVEs total

CVE-2026-330308.8 HIGHNginx UI: Unencrypted Storage of DNS API Tokens and ACME Private Keys
CVE-2026-33028Nginx UI: Race Condition Leads to Persistent Data Corruption and Service Collapse
CVE-2026-33029Nginx UI: DoS via Negative Integer Input in Logrotate Interval
CVE-2026-33026nginx-ui Backup Restore Allows Tampering with Encrypted Backups
CVE-2026-33027Nginx UI: Improper Path Validation Allows Recursive Deletion of the Nginx Configuration Di

IV. Related Vulnerabilities

Same product: nginx-ui
Same vendor: 0xJacky
Same weakness: CWE-306

V. Comments for CVE-2026-33032

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