CVE-2026-49353

HIGH7.5

9Router: Local-Only Access Gate Bypass in 9router via Host Header SpoofING

Published Jul 15, 2026

Modified 2 weeks ago

Details

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.

References

WEB

https://github.com/decolua/9router/commit/5e1c1261368e06dced1cbc650684561b2c8844db

WEB

https://github.com/decolua/9router/commit/bb86808582067e4fc6f004508a919efb9970d1d5

WEB

https://github.com/decolua/9router/releases/tag/v0.4.46

WEB

https://github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-77vf

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-49353

CVSS Analysis