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CVE-2026-54527— JupyterLab Git: Stored XSS leading to RCE

Quick assessment

Affected
jupyterlab jupyterlab-git
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-git是JupyterLab基金会开源的一个 JupyterLab 的 Git 扩展。 jupyterlab-git 0.30.0b3版本至0.54.0之前版本存在跨站脚本漏洞，该漏洞源于PlainTextDiff.ts createHeader()方法将Git文件名直接传递给innerHTML，允许特制文件名在受害者查看Git历史记录中的重命名差异时执行JavaScript。

AI Predicted 6.1 Difficulty: Easy EPSS 0.53% · P42

Affected Version Matrix 1

VendorProduct Version RangeStatus
jupyterlab jupyterlab-git >= 0.30.0b3, < 0.54.0 affected
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I. Basic Information for CVE-2026-54527

Vulnerability Information
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Vulnerability Title
JupyterLab Git: Stored XSS leading to RCE
Source: CVE Program / CVE List V5
Vulnerability Description
JupyterLab Git is a Git extension for JupyterLab. From 0.30.0b3 before 0.54.0, the PlainTextDiff.ts createHeader() method passes Git filenames directly to innerHTML when rendering renamed files in commit history, allowing a crafted filename to execute JavaScript when a victim views the rename diff in the Git History tab. This issue is fixed in version 0.54.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
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-git 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
JupyterLab jupyterlab-git是JupyterLab基金会开源的一个 JupyterLab 的 Git 扩展。 jupyterlab-git 0.30.0b3版本至0.54.0之前版本存在跨站脚本漏洞，该漏洞源于PlainTextDiff.ts createHeader()方法将Git文件名直接传递给innerHTML，允许特制文件名在受害者查看Git历史记录中的重命名差异时执行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-git >= 0.30.0b3, < 0.54.0 -

II. Public POCs for CVE-2026-54527

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III. Intelligence Information for CVE-2026-54527

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Patches & Fixes for CVE-2026-54527 (1)

Vendor Advisories for CVE-2026-54527 (1)

Vendor Pages for CVE-2026-54527 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-54527

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