PT-2026-50557 · Marimo Team · Marimo

Elvin Suleymanov · Published 2026-06-17 · Updated 2026-06-17 · CVE-2026-54386

Mitre

CVSS v3.1

6.1

Medium

Base vector

AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-54386

Affected Products

Marimo

References · 4

• https://github.com/marimo-team/marimo/commit/fdd55c8cf6260ae23bb411dc9d9269def5cf75d6 · Patch
• https://github.com/marimo-team/marimo/pull/9789 · Note
• https://github.com/marimo-team/marimo/releases/tag/0.23.9 · Note
• https://vulncheck.com/advisories/marimo-xss-via-file-query-parameter-in-assets-py · Note