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CVE-2026-67338— JupyterLab before 4.5.9 Stored XSS via Extension Manager

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 jupyterlab是JupyterLab基金会的Web应用开发框架。 jupyterlab 4.5.9之前版本存在跨站脚本漏洞，该漏洞源于扩展管理器未能验证包元数据URL中的URI协议，可能导致存储型跨站脚本攻击，攻击者可发布恶意PyPI包，当用户点击扩展名称时执行任意JavaScript。

CVSS 6.1 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 2

VendorProduct Version RangeStatus
jupyterlab jupyterlab < 4.5.9 affected
4.5.9 unaffected
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I. Basic Information for CVE-2026-67338

Vulnerability Information
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Vulnerability Title
JupyterLab before 4.5.9 Stored XSS via Extension Manager
Source: CVE Program / CVE List V5
Vulnerability Description
JupyterLab before 4.5.9 contains a stored cross-site scripting vulnerability in the Extension Manager that fails to validate URI protocols in package metadata URLs. Attackers can publish malicious PyPI packages with javascript: URLs in project metadata that execute arbitrary JavaScript in the JupyterLab origin when users click the extension name.
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
Web页面编码URIScheme转义处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
jupyterlab 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterLab jupyterlab是JupyterLab基金会的Web应用开发框架。 jupyterlab 4.5.9之前版本存在跨站脚本漏洞，该漏洞源于扩展管理器未能验证包元数据URL中的URI协议，可能导致存储型跨站脚本攻击，攻击者可发布恶意PyPI包，当用户点击扩展名称时执行任意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
jupyterlab jupyterlab 0 ~ 4.5.9 -

II. Public POCs for CVE-2026-67338

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III. Intelligence Information for CVE-2026-67338

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Patches & Fixes for CVE-2026-67338 (2)

Vendor Advisories for CVE-2026-67338 (1)

News Coverage for CVE-2026-67338 (1)

IV. Related Vulnerabilities

Same product: jupyterlab
Same vendor: jupyterlab
Same weakness: CWE-84

V. Comments for CVE-2026-67338

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