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    CVE-2026-42085

    OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. Prior to versions 6.10.5 and 7.0.0-rc3, OpenC3 COSMOS contains a design flaw in the save_tool_config() function that allows saving tool configuration files at arbitrary locations inside the shared /plugins directory tree by supplying crafted configuration filenames. Although the implementation sufficiently mitigates standard path traversal attacks, by canonicalizing filename to an absolute path, all plugins share this same root directory. That enables users to create arbitrary file structures and overwrite existing configuration files within the shared /plugins directory. This issue has been patched in versions 6.10.5 and 7.0.0-rc3.

    Published:May 4, 2026
    Last Modified:May 8, 2026
    EPS:May 4, 2026
    EPSS Score:0.0004
    CVSS Score:4.3

    Affected Products

    Vendor
    Openc3
    Product
    Cosmos

    Exploits

    https://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45hhttps://github.com/OpenC3/cosmos/security/advisories/GHSA-4jvx-93h3-f45h

    Common Weakness Enumeration

    CWE-23 Relative Path Traversal

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-139 Relative Path Traversal
    CAPEC-76 Manipulating Web Input to File System Calls

    Related CVEs

    CVE-2026-42088 (CVSS 9.6) — OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded…
    CVE-2026-42087 (CVSS 9.6) — OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded…
    CVE-2026-42086 (CVSS 4.6) — OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded…
    CVE-2026-42084 (CVSS 8.1) — OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded…
    CVE-2025-68271 (CVSS 10) — OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded…
    CVE-2025-28389 (CVSS 9.8) — Weak password requirements in OpenC3 COSMOS v6.0.0 allow attackers to bypass authentication via a brute force …
    CVE-2025-28386 (CVSS 9.8) — A remote code execution (RCE) vulnerability in the Plugin Management component of OpenC3 COSMOS v6.0.0 allows …
    CVE-2025-28381 (CVSS 7.5) — A credential leak in OpenC3 COSMOS before v6.0.2 allows attackers to access service credentials as environment…
    CVE-2025-28382 (CVSS 7.5) — An issue in the openc3-api/tables endpoint of OpenC3 COSMOS before 6.1.0 allows attackers to execute a directo…
    CVE-2025-28384 (CVSS 9.1) — An issue in the /script-api/scripts/ endpoint of OpenC3 COSMOS before 6.1.0 allows attackers to execute a dire…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High