Is CVE-2026-49353 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-49353?

CVE-2026-49353 has a CVSS v3 severity of HIGH (7.5).

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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.