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CVE-2026-42557— jupyterlab: Command linker attributes in HTML enable one-click command execution from untrusted content

Quick assessment

Affected
jupyterlab jupyterlab
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.

JupyterLab是JupyterLab开源的一个用于交互式和可重复计算的可扩展环境，基于 Jupyter Notebook 和架构。 jupyterlab 4.5.7之前版本存在跨站脚本漏洞，该漏洞源于HTML清理器允许data-commandlinker-command和data-commandlinker-args属性，且CommandLinker监听所有点击事件，可能导致恶意笔记本单元格输出触发任意JupyterLab命令。

CVSS 8.6 · High EPSS 0.71% · P52

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
jupyter notebook >= 7.0.0, < 7.5.6 affected
jupyterlab jupyterlab < 4.5.7 affected
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I. Basic Information for CVE-2026-42557

Vulnerability Information
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Vulnerability Title
jupyterlab: Command linker attributes in HTML enable one-click command execution from untrusted content
Source: CVE Program / CVE List V5
Vulnerability Description
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.7, JupyterLab's HTML sanitizer allowlists data-commandlinker-command and data-commandlinker-args on button elements, while CommandLinker listens for all click events on document.body and executes the named command without checking whether the element came from trusted JupyterLab UI. A notebook with a pre-saved HTML cell output containing a deceptive button can trigger arbitrary JupyterLab commands - including arbitrary code execution - on a single user click, without any code being submitted for execution by the user. This vulnerability is fixed in 4.5.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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
JupyterLab 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterLab是JupyterLab开源的一个用于交互式和可重复计算的可扩展环境，基于 Jupyter Notebook 和架构。 jupyterlab 4.5.7之前版本存在跨站脚本漏洞，该漏洞源于HTML清理器允许data-commandlinker-command和data-commandlinker-args属性，且CommandLinker监听所有点击事件，可能导致恶意笔记本单元格输出触发任意JupyterLab命令。
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
jupyterlab jupyterlab < 4.5.7 -
jupyter notebook >= 7.0.0, < 7.5.6 -

II. Public POCs for CVE-2026-42557

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III. Intelligence Information for CVE-2026-42557

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Vendor Advisories for CVE-2026-42557 (1)

IV. Related Vulnerabilities

Same product: jupyterlab
Same vendor: jupyterlab
Same weakness: CWE-79

V. Comments for CVE-2026-42557

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