GHSA-4jvx-93h3-f45h
Medium · 4.3OpenC3 COSMOS allows arbitrary writes to plugins directory via path-traversed config filenames
CVSS
4.3
EPSS
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Published
Apr 22, 2026
CISA due date
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The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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