Authentication Bypass

9Router is vulnerable to Authentication Bypass. The vulnerability is due to missing authentication checks for the /codex endpoint, where requests bypass the API key validation before being rewritten to protected API routes, allowing unauthenticated attackers to invoke upstream LLM provider APIs...

CVE-2026-55638 9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass

9Router is an AI router & token saver. Prior to 0.5.2, 9router protects /v1, /v1beta, /api/v1, and /api/v1beta in src/dashboardGuard.js but omits /codex before next.config.mjs rewrites /codex/ to /api/v1/responses. A remote unauthenticated attacker can send requests to /codex/ to bypass the API-k...