Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

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 的 CLI 在所有网络接口上托管其 MCP 聚合器，并且仅在操作者明确要求时才强制进行身份验证。 中的 命令将主机地址默认设置为“所有接口”的地址，并绑定固定端口；只有当提供了相应的标志位时才要求提供令牌（token）。因此，默认情况下启动该命令时，聚合器及其背后所有的 MCP 服务器都暴露在所有能够访问该端口的用户面前。 在 0.6.3 版本中，主机地址被默认设置为回环地址（loopback，即 127.0.0.1/::1），并且如果指定主机地址不是回环地址，则拒绝在没有令牌的情况下启动；在

CVSS 9.1 · Critical
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-81094

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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

Affected Products

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

II. Public POCs for CVE-2026-81094

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-81094

请登录查看更多情报信息。

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

No comments yet

Leave a comment