CVE-2026-49353CWE-290

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

High · published July 15, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
28.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00357 · 28.2th percentile
Weakness
CWE-290 · Authentication Bypass by Spoofing
Published
2026-07-15T20:49Z
EPSS history
Timeline
  • 15 JUL 20:49Z
    9Router: Local-Only Access Gate Bypass in 9router via Host Header SpoofING
    cvelistv5