CVE-2026-42086
OpenC3 COSMOS: Self-XSS in the Command Sender
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.
| CWE | CWE-79 |
| Vendor | openc3 |
| Product | cosmos |
| Published | May 4, 2026 |
Get instant alerts for openc3 cosmos
Be the first to know when new medium vulnerabilities affecting openc3 cosmos are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N