MoLing: unauthenticated SSE and wildcard CORS expose tool sessions

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-62863
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-30 21:17:14 UTC
Updated2026-11-06 19:17:54 UTC
DescriptionMoLing 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.

Risk And Classification

Primary CVSS: v3.1 9.6 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

EPSS: 0.003140000 probability, percentile 0.244410000 (date 2026-11-08)

Problem Types: CWE-306 | CWE-942 | CWE-942 CWE-942: Permissive Cross-domain Policy with Untrusted Domains | CWE-306 CWE-306: Missing Authentication for Critical Function

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L
3.1CNADECLARED9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Gojue Moling affected < 0.5.0 Not specified

References

ReferenceSourceLinkTags
github.com/gojue/moling/security/advisories/GHSA-qpgh-hp5g-4vwp [email protected] github.com
github.com/gojue/moling/releases/tag/v0.5.0 [email protected] github.com
github.com/gojue/moling/pull/48 [email protected] github.com
github.com/gojue/moling/commit/ae07f704cbc88d4419fc0fbaec278090fcd0502d [email protected] github.com
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