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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-49353
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-15 21:16:53 UTC
Updated2026-07-16 16:19:10 UTC
Description9Router 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.003570000 probability, percentile 0.280410000 (date 2026-07-20)

Problem Types: CWE-290 | CWE-290 CWE-290: Authentication Bypass by Spoofing

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Decolua 9router affected <= 0.4.45 Not specified

References

ReferenceSourceLinkTags
github.com/decolua/9router/releases/tag/v0.4.46 [email protected] github.com
github.com/decolua/9router/commit/5e1c1261368e06dced1cbc650684561b2c8844db [email protected] github.com
github.com/decolua/9router/security/advisories/GHSA-6g2f-w7g3-77vf 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/decolua/9router/commit/bb86808582067e4fc6f004508a919efb9970d1d5 [email protected] github.com
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