high7.5
CVE-2026-49353
9router has an Incomplete Fix: Local-Only Access Gate Bypass in 9router via Host Header SpoofING
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | 9router | <= 0.4.55 | none recorded |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-6g2f-w7g3-77vf
- 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