OpenC3 cosmos up to 6.10.4/7.0.0-rc2 Password Change unverified password change

Summaryinfo

A vulnerability labeled as critical has been found in OpenC3 cosmos up to 6.10.4/7.0.0-rc2. This affects an unknown function of the component Password Change Handler. Such manipulation leads to unverified password change. This vulnerability is listed as CVE-2026-42084. The attack may be performed from remote. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in OpenC3 cosmos up to 6.10.4/7.0.0-rc2. Affected by this issue is an unknown part of the component Password Change Handler. The manipulation with an unknown input leads to a unverified password change vulnerability. Using CWE to declare the problem leads to CWE-620. When setting a new password for a user, the product does not require knowledge of the original password, or using another form of authentication. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-42084 since 04/23/2026. The exploitation is known to be easy. The attack may be launched remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1552.

Upgrading to version 6.10.5 or 7.0.0-rc3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 2e623714e3426d5ae81b6f8239d4a2a6937ef776 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Vendor

• OpenC3

Name

• cosmos

Version

• 6.10.0
• 6.10.1
• 6.10.2
• 6.10.3
• 6.10.4
• 7.0.0-rc1
• 7.0.0-rc2

License

• open-source

Website

• Product: https://github.com/OpenC3/cosmos/

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