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CVE-2026-62863critical9.6

MoLing: unauthenticated SSE and wildcard CORS expose tool sessions

Impact

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…

Source excerpt · GitHub_M

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

gojue · GitHub_M

moling

1 range
GitHub_M version evidence

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affected

< 0.5.0

unaffected

unknown

Other versions: unknown

Original source description

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.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-62863

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-942 ↗

CWE-942: Permissive Cross-domain Policy with Untrusted Domains

GitHub_M

Related →
CWE-306 ↗

CWE-306: Missing Authentication for Critical Function

GitHub_M

Related →
Contributing organizations · 1
GitHub_M

Assigning organization

2026-10-30

What changed

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References

4 sources
github.com/gojue/moling/security/advisories/GHSA-qpgh-hp5g-4vwp
Security advisoryGitHub_M
github.com/gojue/moling/pull/48
PatchGitHub_M
github.com/gojue/moling/commit/ae07f704cbc88d4419fc0fbaec278090fcd0502d
PatchGitHub_M
github.com/gojue/moling/releases/tag/v0.5.0
Release notesGitHub_M