CVE-2026-67338Medium· 6.1▾ SunlitJupyterLab 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 p…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 33.6 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Aug 2.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.2%
Last analysed / modified upstream
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.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
jupyterlab < 4.5.9Patched in:
jupyterlab 4.5.9Connected by shared product, vendor, weakness, or advisory.
GHSA-vmhf-c436-hxj4MediumJupyterLab: Stored XSS in extension manager through package metadata unsanitized URI protocol
CVE-2026-73626High· 7.5JupyterLab versions >=4.6.0,<=4.6.1 and <=4.5.9 contain an allowlist/blocklist enforcement gap in PyPIExtensionManager.install()
CVE-2026-73417High· 8.3jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture
CVE-2026-73416Mediumjupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture
GHSA-h5v5-8746-g7mmMediumJupyterLab PluginManager lock-rule enforcement bypass
CVE-2026-42557Critical· 9.6JupyterLab's command linker attributes in HTML enable one-click command execution from untrusted content