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CVE-2026-54386— marimo < 0.23.9 XSS via file Query Parameter in assets.py

Quick assessment

Affected
marimo-team marimo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

marimo是marimo团队开源的一个交互式Python笔记本,支持响应式编程和SQL查询。 marimo 0.23.9之前版本存在跨站脚本漏洞，该漏洞源于文件查询参数中单引号转义不当，导致反射型跨站脚本。攻击者可利用以__new__开头的恶意有效载荷绕过404检查，在无需内容安全策略限制的情况下注入任意JavaScript。

CVSS 6.1 · Medium EPSS 0.40% · P32

Affected Version Matrix 1

VendorProduct Version RangeStatus
marimo-team marimo < 0.23.9 affected
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I. Basic Information for CVE-2026-54386

Vulnerability Information
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Vulnerability Title
marimo < 0.23.9 XSS via file Query Parameter in assets.py
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
marimo 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
marimo是marimo团队开源的一个交互式Python笔记本,支持响应式编程和SQL查询。 marimo 0.23.9之前版本存在跨站脚本漏洞，该漏洞源于文件查询参数中单引号转义不当，导致反射型跨站脚本。攻击者可利用以__new__开头的恶意有效载荷绕过404检查，在无需内容安全策略限制的情况下注入任意JavaScript。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
marimo-team marimo 0 ~ 0.23.9 -

II. Public POCs for CVE-2026-54386

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III. Intelligence Information for CVE-2026-54386

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Patches & Fixes for CVE-2026-54386 (2)

Vendor Advisories for CVE-2026-54386 (1)

Vendor Pages for CVE-2026-54386 (1)

IV. Related Vulnerabilities

Same product: marimo
Same vendor: marimo-team
Same weakness: CWE-79

V. Comments for CVE-2026-54386

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