CVE-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 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.

• CWE-620

• https://github.com/OpenC3/cosmos/commit/2e623714e3426d5ae81b6f8239d4a2a6937ef776Patch
• https://github.com/OpenC3/cosmos/releases/tag/v6.10.5Release Notes
• https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3Release Notes
• https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7Exploit, Vendor Advisory
• https://github.com/OpenC3/cosmos/security/advisories/GHSA-wgx6-g857-jjf7Exploit, Vendor Advisory

Published

May 4, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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