gojue Moling up to 0.4.x SSE Mode cross-domain policy

Summaryinfo

A vulnerability labeled as problematic has been found in gojue Moling up to 0.4.x. This affects an unknown function of the component SSE Mode. Such manipulation leads to cross-domain policy. This vulnerability is traded as CVE-2026-62863. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in gojue Moling up to 0.4.x and classified as problematic. Affected by this issue is an unknown part of the component SSE Mode. The manipulation with an unknown input leads to a cross-domain policy vulnerability. Using CWE to declare the problem leads to CWE-942. The product uses a cross-domain policy file that includes domains that should not be trusted. Impacted is confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-62863 since 07/14/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 0.5.0 eliminates this vulnerability.

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Productinfo

Vendor

• gojue

Name

• Moling

Version

• 0.1
• 0.2
• 0.3
• 0.4

Website

• Product: https://github.com/gojue/moling/

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