CVE-2026-42088: critical vulnerability in OpenC3 cosmos
OpenC3 COSMOS: Administrative Actions via the Script Runner Tool
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.6epss 0.3%
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.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
Affected products
OpenC3 · cosmosRelated CVEs — OpenC3 cosmos
In the same product, most dangerous first.
CVE-2024-46977MEDIUMOpenC3 COSMOS allows a path traversal via screen controller (`GHSL-2024-127`)EPSS 0.9%CVE-2026-77602CRITICALOpenC3 COSMOS: Authenticated remote code execution via the user-writable config overlay (table definitions, cmd/tlm definitions, and script suites)EPSS 0.7%CVE-2025-68271CRITICALUnauthenticated Remote Code Execution in openc3-apiEPSS 0.6%CVE-2026-77601HIGHOpenC3 COSMOS: Authenticated OS command injection via the `pypi_url` settingEPSS 0.6%CVE-2024-43795MEDIUMOpenC3 COSMOS vulnerable to cross-site scripting in Login functionality (`GHSL-2024-128`)EPSS 0.5%CVE-2026-77394HIGHOpenC3 COSMOS: Stored, cross-user XSS via Telemetry screen BUTTON widgetEPSS 0.4%