p PatchFirst

CVE-2026-49353

CVE-2026-49353 · 9Router: Local-Only Access Gate Bypass in 9router via Host Header SpoofING

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.5 · High · EPSS 0.3%

Published
Updated

Stack: node

Affected products and versions

  • 9router

    Versions
    • <= 0.4.45: Affected

    No fix published

  • 9router npm

    Affected ranges
    • SEMVER: ≤ 0.4.55

    No fix published

Original sources

Check your server →