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MoLing is a computer-use and browser-use based MCP server. Prior to 0.5.0, when MoLing runs in SSE mode using `-l`, its `/sse` and `/message` HTTP endpoints do not authenticate requests and the `mcp-go` dependency sets `Access-Control-Allow-Origin: *`. A malicious web page can open a cross-origin `EventSource` to `/sse`, including a loopback listener, and read the `endpoint` event to obtain `sessionId`. After a victim running SSE mode visits that page, the attacker can use the disclosed `sessionId` against `/message` to send unauthorized MCP tool calls. Depending on the configured tools, those calls can read or write local files, execute commands or perform other actions. Binding only to loopback does not prevent this browser-mediated attack. This issue is fixed in version 0.5.0.

• https://github.com/gojue/moling/security/advisories/GHSA-qpgh-hp5g-4vwp x_refsource_CONFIRM
• https://github.com/gojue/moling/pull/48 x_refsource_MISC
• https://github.com/gojue/moling/commit/ae07f704cbc88d4419fc0fbaec278090fcd0502d x_refsource_MISC
• https://github.com/gojue/moling/releases/tag/v0.5.0 x_refsource_MISC