high8.6
CVE-2026-55638
9router: Unauthenticated LLM proxy access via /codex rewrite authorization bypass
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | 9router | < 0.5.2 | 0.5.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-8gmq-j984-vp4r
- https://github.com/decolua/9router/security/advisories/GHSA-8gmq-j984-vp4r
- https://nvd.nist.gov/vuln/detail/CVE-2026-55638
- https://github.com/decolua/9router/commit/b282f0554972ea35281520738759d76abcd0b0b3
- https://github.com/decolua/9router/releases/tag/v0.5.2