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.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/marimo-team/marimo/commit/fdd55c8cf6260ae23bb411dc9d9269def5cf75d6
https://github.com/marimo-team/marimo/pull/9789
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

Configurations

No configuration.

History

18 Jun 2026, 14:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-17 22:16

Updated : 2026-07-14 22:17

NVD link : CVE-2026-54386

Mitre link : CVE-2026-54386

CVE.ORG link : CVE-2026-54386

JSON object : View

Products Affected

No product.

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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