CVE-2026-54386

marimo < 0.23.9 XSS via file Query Parameter in assets.py

Published Jun 17, 2026 CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-8m59-7xv8-735h marimo contains a reflected cross-site scripting vulnerability in the notebook page
History
Type Values Removed Values Added
First Time appeared Coreweave
Coreweave marimo
CPEs cpe:2.3:a:coreweave:marimo:*:*:*:*:*:python:*:*
Vendors & Products Coreweave
Coreweave marimo
Type Values Removed Values Added
First Time appeared Marimo-team
Marimo-team marimo
Vendors & Products Marimo-team
Marimo-team marimo
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title marimo < 0.23.9 XSS via file Query Parameter in assets.py
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 8, 2026, 2:05 PM
Reserved
Jun 12, 2026, 8:20 PM
Status
Deferred
Published
Jun 17, 2026, 10:16 PM
Modified
Oct 26, 2026, 11:10 AM