High severityNVD Advisory· Published Jul 15, 2026· Updated Jul 16, 2026
9Router: Local-Only Access Gate Bypass in 9router via Host Header SpoofING
CVE-2026-49353
Description
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
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
9routernpm | <= 0.4.55 | — |
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-6g2f-w7g3-77vfghsaADVISORY
- github.com/decolua/9router/commit/5e1c1261368e06dced1cbc650684561b2c8844dbghsax_refsource_MISCWEB
- github.com/decolua/9router/commit/bb86808582067e4fc6f004508a919efb9970d1d5ghsax_refsource_MISCWEB
- github.com/decolua/9router/releases/tag/v0.4.46mitrex_refsource_MISC
- github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-77vfghsax_refsource_CONFIRMWEB
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