CVE-2026-42084
8.1 · HIGHOverview
CVE-2026-42084 is a high-severity vulnerability affecting openc3 cosmos. It was published on May 4, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical Description
OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to versions 6.10.5 and 7.0.0-rc3, the OpenC3 password change functionality allows a user to change their password without providing the old password, by accepting a valid session token instead. In assumed breach scenarios, this behaviour can be exploited by an attacker who has already obtained a valid session token, to gain persistence in hijacked account (including admin) and prevent legitimate users from accessing the account. This issue has been patched in versions 6.10.5 and 7.0.0-rc3.
Remediation
Check the references section for vendor advisories and patches from openc3. Update cosmos to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| openc3 | cosmos | >= 0, < 6.10.5 | Affected |
References
Frequently Asked Questions
What is CVE-2026-42084?
CVE-2026-42084 is a high-severity vulnerability affecting openc3 cosmos. It was published on May 4, 2026 and has a CVSS 3.1 base score of 8.1 (HIGH).
How severe is CVE-2026-42084?
This vulnerability has a CVSS 3.1 base score of 8.1, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2026-42084?
Check the references section for vendor advisories and patches from openc3. Update cosmos to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-42084?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-42084 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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