Read the docs
TI-2026-40165 Aliases CVE-2026-55638GHSA-8gmq-j984-vp4r

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

Priority HIGH 76CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-862.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.06581 93rd percentileScored 2026-11-07
Fix Fixed 9router (decolua): 0.5.29router (npm): 0.5.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
decolua9routerbefore 0.5.20.5.2Patch availableCNA
—9router (npm)before 0.5.20.5.2Patch availableGHSA-8gmq-j984-vp4r
  • 9router Vendordecolua Affected before 0.5.2 Fixed in 0.5.2 Patch available CNA
  • 9router (npm) Vendor— Affected before 0.5.2 Fixed in 0.5.2 Patch available GHSA-8gmq-j984-vp4r

Remediation

  • Fix · CNA 9router (decolua) Fixed in 0.5.2
  • Fix · GHSA-8gmq-j984-vp4r 9router (npm) Fixed in 0.5.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55638
  2. 2026-10-03 Alias added: GHSA-8gmq-j984-vp4r
  3. 2026-10-26 EPSS moved to the 90th–95th percentile

References

Advisory 1

Other 4

  • TI-2026-36526 9Router: Hardcoded Default fallback JWT Secret Allows Authentication Bypass CVSS 3.1CRITICAL 9.8
  • TI-2026-34059 9Router: Unauthenticated Remote Code Execution via unprotected MCP custom plugin routes CVSS 3.1CRITICAL 10.0
  • TI-2026-44499 9Router 0.4.41 - Unauthenticated API Key Exposure via /api/usage/stats CVSS 4.0CRITICAL 9.3
  • TI-2026-42622 9Router 0.4.41 - Unauthenticated API Exposure via /api/providers CVSS 4.0CRITICAL 9.3
  • TI-2026-44500 9Router 0.4.41 - Unauthenticated Information Disclosure via API Usage Endpoints CVSS 4.0HIGH 8.7
  • TI-2026-40860 9Router: Authenticated Server-Side Request Forgery (SSRF) via OIDC Provider Test Endpoint CVSS 3.1HIGH 8.6
See all 25 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences