CVE-2024-43795: OpenC3 COSMOS vulnerable to cross-site scripting in Login functionality (`GHSL-2024-128`)

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-10-02 · updated 2026-06-17
Weakness: CWE-79

Description

OpenC3 COSMOS provides the functionality needed to send commands to and receive data from one or more embedded systems. The login functionality contains a reflected cross-site scripting (XSS) vulnerability. This vulnerability is fixed in 5.19.0. Note: This CVE only affects Open Source Edition, and not OpenC3 COSMOS Enterprise Edition.

Affected products

OpenC3 cosmos: before 5.19.0 — fixed in 5.19.0

How to fix

Upgrade to a fixed version: OpenC3 cosmos 5.19.0. Check the vendor advisory for mitigations.

References

https://github.com/OpenC3/cosmos/commit/762d7e0e93bdc2f340b1e42acccedc78994a576e
https://github.com/OpenC3/cosmos/security/advisories/GHSA-vfj8-5pj7-2f9g
https://securitylab.github.com/advisories/GHSL-2024-127_GHSL-2024-129_OpenC3_COSMOS

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