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CVE-2026-42084

Openc3 Cosmos vulnerability

8.1 HIGHPublic exploitEPSS 0.44%
  1. Published4 May 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

Openc3 Cosmos7.0.0 · < 6.10.5

Remediation

Fixed in
Openc3 Cosmos≥ 6.10.5

References

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Frequently asked

Is CVE-2026-42084 being actively exploited?

CVE-2026-42084 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.44%.

How severe is CVE-2026-42084?

CVE-2026-42084 has a CVSS 3.1 base score of 8.1, rated high. EPSS estimates a 0.44% probability of exploitation.

Which products are affected by CVE-2026-42084?

Affected products include Openc3 Cosmos.

How do I fix CVE-2026-42084?

Upgrade affected software to a fixed version, for example Openc3 Cosmos 6.10.5 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42084 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.