CVE-2026-42086
OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems.
Published May 4, 2026 · updated Jun 17, 2026 · openc3 cosmos
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, the Command Sender UI uses an unsafe eval() function on array-like command parameters, which allows a user-supplied payload to execute in the browser when sending a command. This creates a self-XSS risk because an attacker can trigger their own script execution in the victim’s session, if allowed to influence the array parameter input, for example via phishing. If successful, an attacker may read or modify data in the authenticated browser context, including session tokens in local storage. This issue has been patched in version 7.0.0.
Code
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No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
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 version 7.0.0, the Command Sender UI uses an unsafe eval() function on array-like command parameters, which allows a user-supplied payload to execute in the browser when sending a command. This creates a self-XSS risk because an attacker can trigger their own script exec
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 version 7.0.0, the Command Sender UI uses an unsafe eval() function on array-like command parameters, which allows a user-supplied payload to execute in the browser when sending a command. This creates a self-XSS risk because an attacker can trigger their own script exec
Affected
- cpe openc3/cosmosversion unspecified
- cpe openc3/cosmos7.0.0
Sources
- CVE.orgVulnerability recordCVE-2026-42086
Official CVE identifier
cve.org - NIST NVDVulnerability recordCVE-2026-42086
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, the Command Sender UI uses an unsafe eval() function on array-like command parameters, which allows a user-supplied payload to execute i
nvd.nist.gov