9Router: Local-Only Access Gate Bypass in 9router via Host Header SpoofING
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.2%
exploitation probability
0.2%top 86% of all CVEs
observed exploitation
nono source reports it
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
Affected products
decolua · 9routerReferences
https://github.com/decolua/9router/commit/5e1c1261368e06dced1cbc650684561b2c8844dbhttps://github.com/decolua/9router/commit/bb86808582067e4fc6f004508a919efb9970d1d5https://github.com/decolua/9router/releases/tag/v0.4.46https://github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-77vf