CVE-2026-54527

JupyterLab Git: Stored XSS leading to RCE

Published: Jul 8, 2026Updated: Jul 15, 2026 Sources: CVE List NVDCWE-79

9.0CRITICAL

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-79

Affected Products

jupyter

oss-projectaka jupyterlab, notebook, jupyter server

jupyterlab-gitMixed

AI / ML / notebook-mlops

jupyterlab

oss-projectaka jupyter lab

jupyterlab-gitOn-prem

DevTools & CI / ide-editor

Exploitability

Official Patch Available

Workaround Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://github.com/jupyterlab/jupyterlab-git/commit/c6d37b88f36aa59aee317930b95e427fb9d6b09b

github.com

https://github.com/jupyterlab/jupyterlab-git/releases/tag/v0.54.0

github.com

https://github.com/jupyterlab/jupyterlab-git/security/advisories/GHSA-f962-v9hr-pfg5

github.com

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