【高危】Uni-CLI: Legacy HTTP MCP transport accepted browser-originated localhost requests

安全速报 · 严重级:高危 · GHSA-v3f4-w7r7-v3hm

漏洞概要

Impact

Uni-CLI versions before 0.225.2 exposed the legacy JSON-RPC-over-HTTP MCP transport on loopback without validating browser Origin headers before routing requests. A malicious web page could send a CORS simple POST request, such as text/plain, to the local /mcp endpoint and deliver a JSON-RPC body to the dispatcher. If the user had started the local MCP HTTP transport, that page could drive tools/call requests against the user's local Uni-CLI server.

The Streamable HTTP transport already enforced this browser-to-localhost boundary. The legacy stateless HTTP path did not, so the two HTTP transports had drifted. This issue is about the browser-to-localhost boundary; it does not change Uni-CLI's local-code-execution trust model.

Patches

Version 0.225.2 fixes the issue by moving the Origin policy into a shared guard and applying it before routing in both HTTP transports. Non-loopback browser Origins are rejected with HTTP 403 before health, OAuth, or /mcp dispatch runs. Non-browser clients that omit Origin remain supported.

Workarounds

Upgrade to 0.225.2 or later. If upgrading is not immediately possible, do not expose the legacy HTTP MCP transport to browser-originated traffic; use the default stdio transport or the Streamable HTTP transport instead.

Credits

Reported privately by Ryan Vonbrubeck (@dodge1218).

受影响组件

生态	组件	受影响版本	修复版本
npm	`@zenalexa/unicli`	< 0.225.2	0.225.2

修复建议

升级 @zenalexa/unicli 至 0.225.2 或更高版本。

参考链接

本文基于 GitHub Advisory Database(CC-BY-4.0 授权)整理,数据来源已注明。