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CVE-2026-62312

9Router: Authenticated RCE via Unvalidated MCP Plugin Arguments

Published: Jul 15, 2026Updated: Jul 16, 2026 Sources: CVE List NVDCWE-78
8.8HIGH
NVD MITRE
EPSS Score
0.7%
Top 50.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

Description

9Router is an AI router & token saver. Prior to 0.5.2, 9Router allows a remote authenticated attacker to achieve arbitrary code execution on the host operating system by combining a Host header bypass of localhost-only routes with unvalidated MCP plugin args passed to child_process.spawn(), allowing malicious custom plugins to execute commands through /api/mcp//sse. This issue is fixed in version 0.5.2.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-78

Affected Products

decolua
commercialaka 9router
9routerEmbedded
Networking Infrastructure / router-switch

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/decolua/9router/commit/da667836cc7584bea0edd893de1d590c9ea279dc
github.com
https://github.com/decolua/9router/releases/tag/v0.5.2
github.com
https://github.com/decolua/9router/security/advisories/GHSA-63p9-g54h-prrp
github.com

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