GitHub Advisoryadvisory · PyPI
GHSA-8m59-7xv8-735h marimo contains a reflected cross-site scripting vulnerability in the notebook page
MEDIUM
Official page ↗
- Aliases
- CVE-2026-54386
- Ecosystem
- PyPI
- Packages
- marimo
- Severity
- Moderate
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weaknesses
- CWE-79
- Reviewed
- 2026-06-18
Affected packages
• PyPI marimo: < 0.23.9 → fixed in 0.23.9
Description
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.
Related
Alias · CVE (1)
- CVE-2026-54386 marimo before 0.23.9 contains a reflected cross-site scripting vulnerability in the notebook page that allows unauthenticated attackers to… vulnerability
Weakness · CWE (1)
- CWE-79 Improper Neutralization of Input During Web Page Generation weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-54386 advisory
- https://github.com/marimo-team/marimo/pull/9789 web
- https://github.com/marimo-team/marimo/commit/fdd55c8cf6260ae23bb411dc9d9269def5cf75d6 web
- https://github.com/marimo-team/marimo package
- https://github.com/marimo-team/marimo/releases/tag/0.23.9 web
- https://www.vulncheck.com/advisories/marimo-xss-via-file-query-parameter-in-assets-py web