marimo < 0.23.9 XSS via file Query Parameter in assets.py
marimo before 0.23.9 contains a reflected cross-site scripting vulnerability in the notebook page that allows unauthenticated attackers to inject arbitrary JavaScript by exploiting improper escaping of single quotes in the file query parameter reflected into an inline JavaScript string literal. Attackers can craft a malicious link with a payload beginning with __new__ to bypass the 404 check and inject JavaScript into the page, which executes without Content-Security-Policy restrictions in the origin of a victim's marimo server.
Critical · CVSS 9.3EPSS 99.56%In KEVPublic exploitFix available
marimo Affected by Pre-Auth Remote Code Execution via Terminal WebSocket Authentication Bypass
marimo is a reactive Python notebook. Prior to 0.23.0, Marimo has a Pre-Auth RCE vulnerability. The terminal WebSocket endpoint /terminal/ws lacks authentication validation, allowing an unauthenticated attacker to obtain a full PTY shell and execute arbitrary system commands. Unlike other WebSocket endpoints (e.g., /ws) that correctly call validate_auth() for authentication, the /terminal/ws endpoint only checks the running mode and platform support before accepting connections, completely skipping authentication verification. This vulnerability is fixed in 0.23.0.
### Summary
The `/mpl/<port>/<route>` endpoint, which is accessible without authentication on default Marimo installations allows for external attackers to reach internal services and arbitrary ports.
### Details
From our understanding, this route is used internally to provide access to interactive matplotlib visualizations.
[marimo/marimo/_server/main.py at main · marimo-team/marimo](https://github.com/marimo-team/marimo/blob/main/marimo/_server/main.py)
This endpoint functions as an unauthenticated proxy, allowing an attacker to connect to any service running on the local machine via the specified `<port>` and `<route>`.
The existence