CVE-2026-77602 OpenC3 COSMOS - Remote Code Execution

OpenC3 COSMOS 5.1.0 to 7.3.0 contains a remote code execution caused by authenticated non-administrator users writing executable content under targets_modified/, letting attackers execute arbitrary code with elevated privileges, exploit requires authenticated non-admin user access.

CVSS base score 9.9 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.57% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Remote Code Execution
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published
23 September 2026
Updated
15 October 2026
Weakness
CWE-94

Vendor fix

Upgrade to version 7.3.0 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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