CVE-2026-84360 — Nginx UI: OTP secure-session step-up can be bypassed via MCP configuration tools
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…
Published: 2026-10-12 · CVSS: 8.1 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7