CVE-2026-33032 (GCVE-0-2026-33032)

Vulnerability from cvelistv5 – Published: 2026-03-30 17:58 – Updated: 2026-04-16 21:42
VLAI Previdian
Title
Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-30 18:37 UTC
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7920 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
0xJacky nginx-ui Affected: <= 2.3.5
guessed Create a notification for this product.
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 075cc2a7-4d56-4071-b76f-6be80c5973a7

Vulnerability ID: CVE-2026-33032

Status: Confirmed

Status Updated: 2026-04-15 16:05 UTC

Exploited: Yes

Timestamps
First Seen: 2026-04-15
Asserted: 2026-04-15
Scope
Notes: KEVIntel entry: Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover | Affected: 0xJacky / nginx-ui | CVSS: 9.8 (CRITICAL) | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover
Vendor 0xJacky
Product nginx-ui
Added Date 2026-04-15T16:05:13.000Z
Cvss Score 9.8
Epss Score None
Cvss Severity CRITICAL
Epss Percentile None
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-19 12:42 UTC | Updated: 2026-06-19 12:42 UTC
Show details on NVD website
To clipboard 

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