CVE-2026-54386
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.
- Affected products
- Marimo
- Fix
- Available
- CVSS 3.1
- 6.1 MEDIUM
- EPSS
- 0.2% (15th percentile)
- Weakness
- CWE-79
- NVD status
- Deferred
- Published
- 2026-06-17
No indexed exploits for CVE-2026-54386 yet
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No exploit for CVE-2026-54386 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.