CVE-2026-42088

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to version 7.0.0-rc3, the Script Runner widget allows users to execute Python and Ruby scripts directly from the openc3-COSMOS-script-runner-api container. Because all the docker containers share a network, users can execute specially crafted scripts to bypass the API permissions check and perform administrative actions, including reading and modifying data inside the Redis database, which can be used to read secrets and change COSMOS settings, as well as read and write to the buckets service, which holds configuration, log, and plugin files. These actions are normally only available from the Admin Console or with administrative privileges. Any user with permission to create and run scripts can connect to any service in the docker network. This issue has been patched in version 7.0.0-rc3.

• CWE-250

• https://github.com/OpenC3/cosmos/releases/tag/v7.0.0Release Notes
• https://github.com/OpenC3/cosmos/releases/tag/v7.0.0-rc3Release Notes
• https://github.com/OpenC3/cosmos/security/advisories/GHSA-2wvh-87g2-89hrExploit, Vendor Advisory
• https://github.com/OpenC3/cosmos/security/advisories/GHSA-2wvh-87g2-89hrExploit, 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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