CVE-2026-62863

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.

CVSS v3 9.6 CRITICAL

9.6^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 2.8 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact LOW

Scope CHANGED

References

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

Configurations

No configuration.

History

30 Oct 2026, 21:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-30 21:17

Updated : 2026-10-30 21:17

NVD link : CVE-2026-62863

Mitre link : CVE-2026-62863

CVE.ORG link : CVE-2026-62863

JSON object : View

Products Affected

No product.

CWE

CWE-306

Missing Authentication for Critical Function

CWE-942

Permissive Cross-domain Security Policy with Untrusted Domains

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