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CVE-2026-42086

CVE-2026-42086 · OpenC3 COSMOS: Self-XSS in the Command Sender

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 4.6 · Medium · EPSS 0.2% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • cosmos

    Versions
    • < 7.0.0: Affected

    No fix published

  • openc3 RubyGems

    Versions
    • 5.0.10
    • 5.0.11
    • 5.0.6
    • 5.0.7
    • 5.0.8
    • 5.0.9
    • 5.1.0
    • 5.1.1
    • 5.10.0
    • 5.10.1
    • 5.11.0
    • 5.11.1
    • 5.11.2
    • 5.11.3
    • 5.12.0
    • 5.13.0
    • 5.14.0
    • 5.14.1
    • 5.14.2
    • 5.15.0
    • 5.15.1
    • 5.15.2
    • 5.16.0
    • 5.16.1
    • 5.16.2
    • 5.17.0
    • 5.17.1
    • 5.18.0
    • 5.19.0
    • 5.2.0
    • 5.20.0
    • 5.3.0
    • 5.4.0
    • 5.4.1
    • 5.4.2
    • 5.4.3.pre.beta0
    • 5.5.0
    • 5.5.0.pre.beta0
    • 5.5.1
    • 5.5.2
    • 5.5.2.pre.beta0
    • 5.6.0
    • 5.6.1
    • 5.7.0
    • 5.7.2
    • 5.8.0
    • 5.8.1
    • 5.9.0
    • 5.9.1
    • 6.0.0
    • 6.0.1
    • 6.0.2
    • 6.1.0
    • 6.10.0
    • 6.10.1
    • 6.10.2
    • 6.10.3
    • 6.10.4
    • 6.10.5
    • 6.10.6
    • 6.2.0
    • 6.2.1
    • 6.3.0
    • 6.4.0
    • 6.4.1
    • 6.4.2
    • 6.5.0
    • 6.5.1
    • 6.6.0
    • 6.7.0
    • 6.8.0
    • 6.8.1
    • 6.9.0
    • 6.9.1
    • 6.9.2
    • 7.0.0.pre.rc1
    • 7.0.0.pre.rc2
    • 7.0.0.pre.rc3
    Affected ranges
    • ECOSYSTEM: < 7.0.0

    Update to 7.0.0

  • openc3 PyPI

    Versions
    • 0.1.0
    • 5.10.0
    • 5.10.1
    • 5.11.0
    • 5.11.1
    • 5.11.2
    • 5.11.3
    • 5.12.0
    • 5.13.0
    • 5.14.0
    • 5.14.1
    • 5.14.2
    • 5.15.0
    • 5.15.1
    • 5.15.2
    • 5.16.0
    • 5.16.1
    • 5.16.2
    • 5.17.0
    • 5.17.1
    • 5.18.0
    • 5.19.0
    • 5.20.0
    • 5.9.2b0
    • 6.0.0
    • 6.0.1
    • 6.0.2
    • 6.1.0
    • 6.10.0
    • 6.10.1
    • 6.10.2
    • 6.10.3
    • 6.10.4
    • 6.10.5
    • 6.10.6
    • 6.2.0
    • 6.2.1
    • 6.3.0
    • 6.4.0
    • 6.4.1
    • 6.4.2
    • 6.5.0
    • 6.5.1
    • 6.6.0
    • 6.7.0
    • 6.8.0
    • 6.8.1
    • 6.9.0
    • 6.9.1
    • 6.9.2
    • 7.0.0rc2
    • 7.0.0rc3
    Affected ranges
    • ECOSYSTEM: < 7.0.0

    Update to 7.0.0

Original sources

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