TI-2026-25478 Aliases CVE-2026-33032 GHSA-h6c2-x2m2-mwhf

Nginx UI: Unauthenticated MCP Endpoint Allows Remote Nginx Takeover

HIGH 82CWE-306Published 2026-03-30 · Updated 2026-04-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.35273 98th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
0xJacky	nginx-ui	up to 2.3.5	—	No fix listed	CNA
—	github.com/0xJacky/Nginx-UI (Go)	up to 1.99	—	No fix listed	GHSA-h6c2-x2m2-mwhf

nginx-ui Vendor0xJacky Affected up to 2.3.5 Fixed in — No fix listed CNA
github.com/0xJacky/Nginx-UI (Go) Vendor— Affected up to 1.99 Fixed in — No fix listed GHSA-h6c2-x2m2-mwhf

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:nginxui:nginx_ui::::::::	up to 2.3.5	Vulnerable	0xJacky

cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:* Versions up to 2.3.5 Vulnerable ·0xJacky

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-33032
2026-10-03 Alias added: GHSA-h6c2-x2m2-mwhf
2026-10-25 EPSS moved to the 95th–99th percentile

References

Exploit 1

https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h6c2-x2m2-mwhf

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-33032

Other 4

TI-2026-25472 nginx-ui Backup Restore Allows Tampering with Encrypted Backups CVSS 4.0CRITICAL 9.4
TI-2026-22288 Nginx UI: Unauthenticated Backup Download with Encryption Key Disclosure CVSS 3.1CRITICAL 9.8
TI-2024-15821 Nginx-UI arbitrary file write through the Import Certificate feature CVSS 3.1CRITICAL 9.8
TI-2026-70057 Code injection in Nginx UI backup restore allows code execution CVSS 4.0CRITICAL 9.4
TI-2026-32056 Nginx UI: Server-Side Request Forgery (SSRF) via Cluster Proxy Middleware Allows Access to Internal Services CVSS 3.1CRITICAL 9.9
TI-2026-30543 nginx-ui: Unauthenticated first-boot instance claim via POST /api/install allows remote bootstrap takeover CVSS 3.1CRITICAL 9.8

See all 31 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences