CVE-2026-107807: Nginx UI: Node Secret Credential Exposure via URL Query Parameter

nginx-ui’s Node.Secret is a master credential that bypasses all JWT/password authentication for the entire API. The application accepts this credential via a URL query parameter (?node_secret=), causing it to be recorded in plaintext in HTTP access logs, reverse proxy logs, browser history, and HTTP Referer headers. Additionally, the official cluster configuration format embeds node secrets directly into URL query strings stored in app.ini and environment variables, creating a systemic credential exposure pattern across the entire cluster deployment model.

An attacker who gains read access to any log aggregation system, proxy log, or configuration file can extract the node secret and obtain full, persistent, unauthenticated administrative access to the nginx-ui API — including reading TLS private keys, modifying nginx configurations, and (when chained with Bug #1) achieving OS-level code execution.