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Description

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.

PUBLISHED Reserved 2026-04-23 | Published 2026-05-04 | Updated 2026-05-04 | Assigner GitHub_M




MEDIUM: 4.6CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 7.0.0
affected

References

github.com/...cosmos/security/advisories/GHSA-ffq5-qpvf-xq7x exploit

github.com/...cosmos/security/advisories/GHSA-ffq5-qpvf-xq7x

cve.org (CVE-2026-42086)

nvd.nist.gov (CVE-2026-42086)

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