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CVE-2026-81094— mcp-router CLI before 0.6.3 Binds the MCP Aggregator to All Interfaces Without Requiring Authentication

Quick assessment

Affected
mcp-router mcp-router
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCP Router是MCP Router组织的一款MCP协议请求路由中间件。 MCP Router 0.6.3之前版本存在授权问题漏洞，该漏洞源于serve命令默认将所有接口地址绑定到固定端口且仅当提供标志时才要求令牌，可能导致任何能访问该端口的攻击者访问聚合器及其前端的所有MCP服务器。

CVSS 9.1 · Critical EPSS 0.61% · P49

Affected Version Matrix 2

VendorProduct Version RangeStatus
mcp-router mcp-router < 0.6.3 affected
4c4642cfd274097ec8b33ecd3047390829c79d35 unaffected
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I. Basic Information for CVE-2026-81094

Vulnerability Information
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Vulnerability Title
mcp-router CLI before 0.6.3 Binds the MCP Aggregator to All Interfaces Without Requiring Authentication
Source: CVE Program / CVE List V5
Vulnerability Description
The mcp-router CLI served its MCP aggregator on every interface and enforced authentication only when the operator asked for it. The serve command in apps/cli/src/commands/serve.ts defaulted its host to the all-interfaces address on a fixed port, and required a token only when the corresponding flag was supplied, so a default invocation exposed the aggregator, and every MCP server it fronted, to anyone able to reach the port. Release 0.6.3 defaults the host to the loopback address and refuses to start without a token whenever the host it is given is not a loopback address; no earlier release carries either check.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
MCP Router 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCP Router是MCP Router组织的一款MCP协议请求路由中间件。 MCP Router 0.6.3之前版本存在授权问题漏洞，该漏洞源于serve命令默认将所有接口地址绑定到固定端口且仅当提供标志时才要求令牌，可能导致任何能访问该端口的攻击者访问聚合器及其前端的所有MCP服务器。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
mcp-router mcp-router 0 ~ 0.6.3 -

II. Public POCs for CVE-2026-81094

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III. Intelligence Information for CVE-2026-81094

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Patches & Fixes for CVE-2026-81094 (1)

Vendor Advisories for CVE-2026-81094 (2)

Proof of Concept for CVE-2026-81094 (1)

IV. Related Vulnerabilities

Same weakness: CWE-306

V. Comments for CVE-2026-81094

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