CVE-2026-84360CWE-288

CVE-2026-84360

High · published October 13, 2026

CVSS v3.1
8.1
EPSS
0%
Percentile
27.1
In the wild
Unconfirmed
What it is

Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, the HTTP configuration mutation routes require RequireSecureSession, but /mcp and /mcp_message require only ordinary authentication before exposing nginx_config_add and nginx_config_modify. An OTP-enabled user with a normal JWT but no valid X-Secure-Session-ID can therefore create or modify Nginx configuration and trigger reload behavior through MCP, bypassing the intended step-up control. This issue is fixed in version 2.4.1.

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00347 · 27.1th percentile
Weakness
CWE-288 · Authentication Bypass Using an Alternate Path or Channel
Published
2026-10-13T01:17Z
References (4)
https://github.com/0xJacky/nginx-ui/commit/23d1934099b05b2a01589b48129dc3d3159d91c2 · [email protected]https://github.com/0xJacky/nginx-ui/releases/tag/v2.4.1 · [email protected]https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-vc32-4gwf-77xp · [email protected]https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-vc32-4gwf-77xp · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 14 OCT 03:33Z
    EPSS moved — → 0%
    epss
  • 12 OCT 21:08Z
    Nginx UI: OTP secure-session step-up can be bypassed via MCP configuration tools
    cvelistv5
  • 12 OCT 21:08Z
    Nginx UI: OTP secure-session step-up can be bypassed via MCP configuration tools
    cvelistv5