CVE-2026-54386
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk15th percentile — higher than 15% of all known CVEs
Summary
Marimo before 0.23.9 contains a reflected cross-site scripting vulnerability in the notebook page that allows unauthenticated attackers to inject arbitrary JavaScript.
Risk Assessment
Attackers can exploit this vulnerability to inject malicious code, potentially leading to user data theft or session hijacking.
Recommendation
It is recommended to update Marimo to version 0.23.9 or later to mitigate this vulnerability and implement appropriate content security policies.
Original NVD description (English source)
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.