CVE-2026-42557— jupyterlab: Command linker attributes in HTML enable one-click command execution from untrusted content
Possible ATT&CK Techniques 1AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 2
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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Potential authentication and CSRF tokens leak in JupyterLab
Same vendor: jupyterlab
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jupyterlab: Extension Manager API/GUI Policy Discrepancy all - CVE-2025-59842
JupyterLab LaTeX typesetter links did not enforce `noopener` - CVE-2025-30370
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Remote Code Execution (RCE) vulnerability in jupyterlab exte
Same weakness: CWE-79
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V. Comments for CVE-2026-42557
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