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CVE-2026-102831— JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard

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 is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 4.5.0 until 4.5.11 and 4.6.4, from Notebook 7.5.0 until 7.6.3, and from JupyterLite Core 0.7.0 until 0.8.4, the syst

CVSS 8.1 · High

Affected Version Matrix 4

VendorProduct Version RangeStatus
jupyterlab jupyterlab >= 4.5.0, < 4.5.11 affected
>= 4.6.0, < 4.6.4 affected
jupyterlab jupyterlite-core >= 0.7.0, < 0.8.4 affected
jupyterlab notebook >= 7.5.0, < 7.6.3 affected
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I. Basic Information for CVE-2026-102831

Vulnerability Information

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Vulnerability Title
JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard
Source: CVE Program / CVE List V5
Vulnerability Description
JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 4.5.0 until 4.5.11 and 4.6.4, from Notebook 7.5.0 until 7.6.3, and from JupyterLite Core 0.7.0 until 0.8.4, the system clipboard cell-paste path accepts attacker-controlled cell JSON without clearing metadata.trusted. When useSystemClipboardForCells is active and pasteCodeCellsWithoutOutput is disabled, a pasted code cell can mark HTML output as trusted, bypass output sanitization, and execute script in the authenticated JupyterLab origin without executing the cell. Markdown and raw cells are not affected because their output is sanitized. This issue is fixed in JupyterLab 4.5.11 and 4.6.4, Notebook 7.6.3, and JupyterLite Core 0.8.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyterlab jupyterlab >= 4.5.0, < 4.5.11 -
jupyterlab notebook >= 7.5.0, < 7.6.3 -
jupyterlab jupyterlite-core >= 0.7.0, < 0.8.4 -

II. Public POCs for CVE-2026-102831

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III. Intelligence Information for CVE-2026-102831

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Vendor Pages for CVE-2026-102831 (2)

Other References for CVE-2026-102831 (4)

Same Patch Batch · jupyterlab · 2026-09-29 · 3 CVEs total

CVE-2026-102830 6.8 MEDIUM JupyterLab: Cross-site scripting (XSS) in JupyterLab via crafted language package (jupyter
CVE-2026-102904 5.4 MEDIUM JupyterLab: Argument injection in JupyterLab extension uninstall exposes server-readable f

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-102831

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