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TI-2026-40858 Aliases CVE-2026-56675GHSA-x5c9-v98j-722r

9router: Reverse proxy locality collapse allows unauthenticated access to 9router /v1 APIs

Priority MEDIUM 43CWE-287Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

9Router is an AI router & token saver. Prior to 0.5.2, 9router treats loopback requests as trusted and allows /v1/* access without an API key, so a same-host reverse proxy that forwards public traffic to the backend through 127.0.0.1 causes src/dashboardGuard.js to misclassify external requests as local. A remote unauthenticated attacker can access /v1 APIs such as /v1/models and may abuse configured upstream provider credentials through /v1 proxy endpoints depending on enabled providers. This issue is fixed in version 0.5.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00501 43rd 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
None
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-x5c9-v98j-722r
  • 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-x5c9-v98j-722r

Remediation

  • Fix · CNA 9router (decolua) Fixed in 0.5.2
  • Fix · GHSA-x5c9-v98j-722r 9router (npm) Fixed in 0.5.2 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-56675
  2. 2026-10-03 Alias added: GHSA-x5c9-v98j-722r

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