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CVE-2026-102830— JupyterLab: Cross-site scripting (XSS) in JupyterLab via crafted language package (jupyterlab.json)

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 3.0.0 until 4.5.11 and 4.6.4, and in JupyterLite Core 0.8.3 and earlier, the Plural-Forms header in a selected third

CVSS 6.8 · Medium

Affected Version Matrix 3

VendorProduct Version RangeStatus
jupyterlab jupyterlab >= 3.0.0, < 4.5.11 affected
>= 4.6.0, < 4.6.4 affected
jupyterlab jupyterlite-core < 0.8.4 affected
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I. Basic Information for CVE-2026-102830

Vulnerability Information

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Vulnerability Title
JupyterLab: Cross-site scripting (XSS) in JupyterLab via crafted language package (jupyterlab.json)
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 3.0.0 until 4.5.11 and 4.6.4, and in JupyterLite Core 0.8.3 and earlier, the Plural-Forms header in a selected third-party language pack can append JavaScript after a valid plural rule because prefix-only regular-expression validation accepts a matching prefix without requiring the entire header to match. JupyterLab passes the accepted expression to new Function, so loading the catalogue and translating a plural string executes the appended code in the authenticated JupyterLab origin. Where Jupyter Server kernels, terminals, and APIs are exposed, the code can use authenticated server APIs to read or modify files and run code. Impact is much more limited in JupyterLite because it typically lacks most exposed Jupyter Server surfaces. The default English locale is unaffected because it does not load a translation catalogue. This issue is fixed in JupyterLab 4.5.11 and 4.6.4 and JupyterLite Core 0.8.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/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 >= 3.0.0, < 4.5.11 -
jupyterlab jupyterlite-core < 0.8.4 -

II. Public POCs for CVE-2026-102830

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III. Intelligence Information for CVE-2026-102830

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Patches & Fixes for CVE-2026-102830 (3)

Vendor Advisories for CVE-2026-102830 (1)

Vendor Pages for CVE-2026-102830 (2)

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

CVE-2026-102831 8.1 HIGH JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the sy
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-2026-102830

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