What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-15 · updated 2026-10-24
• Weakness: CWE-290

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 products

• decolua 9router: through 0.4.45

References

• https://github.com/decolua/9router/commit/5e1c1261368e06dced1cbc650684561b2c8844db
• https://github.com/decolua/9router/commit/bb86808582067e4fc6f004508a919efb9970d1d5
• https://github.com/decolua/9router/releases/tag/v0.4.46
• https://github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-77vf
• https://github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-77vf

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