# marimo vulnerable to proxy abuse of /mpl/{port}/

Source: https://junglewise.ai/threats/marimo-vulnerable-to-proxy-abuse-of-mpl-port-57847eda  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-10-01  
License: CC BY 4.0 with a link back

Severity: medium · CVSS 4 · Published 2025-10-01

marimo vulnerable to proxy abuse of /mpl/{port}/

Technologies: [marimo (PyPI)](https://junglewise.ai/threats/technologies/pypi-marimo). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Medium severity, with a CVSS score of 4, published 1 October 2025.

**Which products and versions are affected?** marimo (PyPI) ECOSYSTEM:introduced=0.9.20,fixed=0.16.4.

**Is there a fix for This vulnerability?** Yes. marimo (PyPI): upgrade to 0.16.4 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run marimo (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- marimo (PyPI): upgrade to 0.16.4 or later

  ```sh
  pip install "marimo>=0.16.4"
  ```


## Affected products

- marimo (PyPI) ECOSYSTEM:introduced=0.9.20,fixed=0.16.4

## Related threats

- [marimo XSS via file query parameter in notebook page](https://junglewise.ai/threats/cve-2026-54386-marimo-xss-via-file-query-parameter-in-notebook-page)
- [Marimo: Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass](https://junglewise.ai/threats/cve-2026-39987-marimo-pre-auth-remote-code-execution-via-terminal-websocket)