CVE-2026-55638CWE-862CWE-863

9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass

High · published July 10, 2026

CVSS v3.1
8.6
EPSS
1%
Percentile
48.6
In the wild
Unconfirmed
What it is

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-key gate and cause the server to make upstream provider calls using operator-stored LLM provider credentials. This issue is fixed in version 0.5.2.

The record
Technical detail
CVSS v3.1
8.6 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CVSS v4.0
Not supplied
EPSS
0.00611 · 48.6th percentile
Weaknesses
CWE-862 · Missing Authorization; CWE-863 · Incorrect Authorization
Published
2026-07-10T15:38Z
EPSS history
Timeline
  • 10 JUL 15:38Z
    9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass
    cvelistv5