CVE-2026-58497

CVE-2026-58497 · Uni-CLI: Legacy HTTP MCP transport accepted browser-originated localhost requests

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Uni-CLI gives people and agents one command interface for websites, browsers, desktop applications, local tools, and MCP. Prior to version 0.225.2, Uni-CLI 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. This issue has been patched in version 0.225.2.

CVSS 8.6 · High

Published

2026-10-23T14:49:42.619Z

Updated

2026-10-23T20:57:14.612Z

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