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Vulnerabilities

Vulnerability · CVE-2026-42084

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems.

Published May 4, 2026 · catalog updated Jun 17, 2026 · OpenC3 COSMOS provides the

Check if you run it

No confirmed exploitation is on record for CVE-2026-42084. EPSS is 0.44%. Act only if a listed version of OpenC3 COSMOS provides the is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OpenC3 COSMOS provides the).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.1
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.44%
Remediation
Advisory link
Affected products
cpe openc3/cosmos

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe openc3/cosmos7.0.0

How to fix CVE-2026-42084

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-42084. EPSS is 0.44%. Act only if a listed version of OpenC3 COSMOS provides the is installed.

Which versions are affected?

Compare what you have installed with 7.0.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-620. EPSS 0.44%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 4, 2026 · NIST NVD

    Detected

    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

  2. Jun 17, 2026 · NIST NVD

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2026-42084

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-42084

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-42084

    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 a

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.