9Router: Local-Only Access Gate Bypass in 9router via Host Header SpoofING
Priority HIGH 66CWE-290Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · High · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-290.
Summary
9Router is an AI router & token saver. In 0.4.45 and earlier, 9Router's src/dashboardGuard.js local-only access gate used Host and Origin headers in isLocalRequest() to protect /api/mcp/*, /api/tunnel/*, and /api/cli-tools/*, allowing header spoofing in reverse proxy or tunnel deployments to reach MCP child process stdin paths.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00335 27th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| decolua | 9router | up to 0.4.45 | — | No fix listed | CNA |
| — | 9router (npm) | up to 0.4.55 | — | No fix listed | GHSA-6g2f-w7g3-77vf |
- 9router Vendordecolua Affected up to 0.4.45 Fixed in — No fix listed CNA
- 9router (npm) Vendor— Affected up to 0.4.55 Fixed in — No fix listed GHSA-6g2f-w7g3-77vf
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-49353
- 2026-10-03 Alias added: GHSA-6g2f-w7g3-77vf
References
Other 5
- https://github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-77vf
- https://github.com/decolua/9router/commit/5e1c1261368e06dced1cbc650684561b2c8844db
- https://github.com/decolua/9router/commit/bb86808582067e4fc6f004508a919efb9970d1d5
- https://github.com/decolua/9router/releases/tag/v0.4.46
- https://github.com/decolua/9router
More decolua vulnerabilities
- 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
Sources
- CVE-2026-49353 · CVE Program
- CVE-2026-49353 · NVD
- FIRST EPSS
- GHSA-6g2f-w7g3-77vf · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences