CVE-2026-61542 Gearboy Gearsystem - Authentication Bypass

Gearboy Gearsystem contains an insecure MCP HTTP mode caused by binding to INADDR_ANY and lack of authorization checks on MCP requests, letting remote attackers invoke emulator/debugging operations, exploit requires network access to MCP port.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Authentication Bypass
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L
Published
28 October 2026
Updated
29 October 2026
Weakness
CWE-306

Vendor fix

Update to Gearboy version 3.8.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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