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

What is CVE-2024-43795?

CVE-2024-43795 is a medium-severity cross-site scripting vulnerability in OpenC3 cosmos, published on 2 Oct 2024. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-79

Which versions are affected by CVE-2024-43795?

7 open source packages ship an affected version, including openc3 and @openc3/tool-common. It affects 1 product.

Products include Openc3 Cosmos.

How do I fix CVE-2024-43795?

Upgrade openc3 to 5.19.0 or later.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2024-43795 being exploited?

There is no known exploitation of CVE-2024-43795 in the wild and no public exploit code.

Other vulnerabilities in OpenC3 cosmos

• CVE-2025-28386 Code injection in n/a Critical 9.8
• CVE-2025-28388 Hardcoded credentials in n/a Critical 9.8
• CVE-2025-28389 Weak cryptography in n/a Critical 9.8
• CVE-2026-42087 OpenC3 COSMOS: SQL Injection in QuestDB Time-Series Data Base Critical 9.6
• CVE-2026-42088 OpenC3 COSMOS: Administrative Actions via the Script Runner Tool Critical 9.6

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vfj8-5pj7-2f9g, PYSEC-2024-100.