CVE-2026-67338
Published:August 01, 2026
Updated:August 04, 2026
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.
Affected Packages
jupyterlab (CONDA):
Affected version(s) >=0.0.5 <4.5.9Fix Suggestion:
Update to version 4.5.9https://github.com/jupyterlab/jupyterlab.git (GITHUB):
Affected version(s) >=v0.0.2 <v4.5.9Fix Suggestion:
Update to version v4.5.9jupyterlab (PYTHON):
Affected version(s) >=0.0.1 <4.5.9Fix Suggestion:
Update to version 4.5.9Related Resources (8)
Do you need more information?
Contact UsCVSS v4
Base Score:
5.1
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
PASSIVE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
LOW
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
6.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Encoded URI Schemes in a Web Page
EPSS
Base Score:
0.18