CVE-2025-28389: OPENC3 Cosmos

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Weak password requirements in OpenC3 COSMOS v6.0.0 allow attackers to bypass authentication via a brute force attack.

Affected products

• OPENC3 Cosmos: version 6.0.0 only

Published 2025-06-13. Last modified 2026-06-17.