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Vulnerability record · CVE-2026-49353 · published 15 July 2026

CVE-2026-49353: Authentication bypass by spoofing vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.36% · top 73.1% CWE-290 · Authentication bypass by spoofing Deferred
7.5CVSS 3.1 base score
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
16 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-49353), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.