What is CVE-2026-54386?

CVE-2026-54386 is a medium-severity vulnerability in Marimo-team Marimo, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-17.

How severe is CVE-2026-54386?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Marimo-team Marimo

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 param…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Marimo-team Marimo — versions 0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-54386?: CVE-2026-54386 is a medium-severity vulnerability in Marimo-team Marimo, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-06-17.
How severe is CVE-2026-54386?: Medium severity. CVSS v3 base score is 6.1 out of 10.