decolua 9router up to 0.4.59 MCP Plugin Registration child_process.spawn default password

Summaryinfo

A vulnerability was found in decolua 9router up to 0.4.59. It has been rated as very critical. Affected by this issue is the function child_process.spawn of the component MCP Plugin Registration. The manipulation leads to default password. This vulnerability is listed as CVE-2026-63732. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in decolua 9router up to 0.4.59. It has been rated as very critical. This issue affects the function child_process.spawn of the component MCP Plugin Registration. The manipulation with an unknown input leads to a default password vulnerability. Using CWE to declare the problem leads to CWE-1393. The product uses default passwords for potentially critical functionality. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

9router 0.4.59 (fixed in 0.4.60) contains a chain of vulnerabilities: a hardcoded default password (123456) that authenticates any fresh installation, a bypass of the LOCAL_ONLY network gate via a spoofed Host header, and unvalidated arguments passed to child_process.spawn() when registering MCP plugins. A remote, unauthenticated attacker can log in with the default credential, spoof the Host header to reach local-only routes, and register a malicious MCP plugin (e.g. node -e <payload>) to achieve arbitrary code execution on the host operating system when the plugin's SSE endpoint is triggered.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-63732 since 07/18/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/23/2026).

Upgrading to version 0.4.60 eliminates this vulnerability.

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Productinfo

Type

• Router Operating System

Vendor

• decolua

Name

• 9router

Version

• 0.4.0
• 0.4.1
• 0.4.2
• 0.4.3
• 0.4.4
• 0.4.5
• 0.4.6
• 0.4.7
• 0.4.8
• 0.4.9
• 0.4.10
• 0.4.11
• 0.4.12
• 0.4.13
• 0.4.14
• 0.4.15
• 0.4.16
• 0.4.17
• 0.4.18
• 0.4.19
• 0.4.20
• 0.4.21
• 0.4.22
• 0.4.23
• 0.4.24
• 0.4.25
• 0.4.26
• 0.4.27
• 0.4.28
• 0.4.29
• 0.4.30
• 0.4.31
• 0.4.32
• 0.4.33
• 0.4.34
• 0.4.35
• 0.4.36
• 0.4.37
• 0.4.38
• 0.4.39
• 0.4.40
• 0.4.41
• 0.4.42
• 0.4.43
• 0.4.44
• 0.4.45
• 0.4.46
• 0.4.47
• 0.4.48
• 0.4.49
• 0.4.50
• 0.4.51
• 0.4.52
• 0.4.53
• 0.4.54
• 0.4.55
• 0.4.56
• 0.4.57
• 0.4.58
• 0.4.59

Website

• Product: https://github.com/decolua/9router/

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