marimo contains a reflected cross-site scripting vulnerability in the notebook page
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 software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | marimo | < 0.23.9 | 0.23.9 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-54386
- https://github.com/marimo-team/marimo/pull/9789
- https://github.com/marimo-team/marimo/commit/fdd55c8cf6260ae23bb411dc9d9269def5cf75d6
- https://github.com/marimo-team/marimo
- https://github.com/marimo-team/marimo/releases/tag/0.23.9
- https://www.vulncheck.com/advisories/marimo-xss-via-file-query-parameter-in-assets-py
- https://pypi.org/project/marimo
- https://github.com/advisories/GHSA-8m59-7xv8-735h
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N- Weakness (CWE)
CWE-79- Platform
- Python (PyPI)
- Package
marimo- Disclosed
- 18.06.2026
- Updated
- 11.10.2026 14:18
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2026-2619 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-8m59-7xv8-735h - CC BY 4.0
Vulnerability history: marimo
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 10.2025 06.2026
- Without a fix
- 0
- Exploited in attacks
- 1
Severity breakdown
- Critical 1
- Medium 2
Disclosures per year
- 2025: 1
- 2026: 2
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marimo contains a reflected cross-site scripting vulnerability in the notebook page this entry
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