CVE-2026-67338
published 2026-08-01CVE-2026-67338: 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…
PriorityP428medium6.1CVSS 3.1
AVNACLPRNUIRSCCLILAN
EPSS
0.30%
22.1th percentile
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
17 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| jupyterlab | jupyterlab | < 4.5.9 | 4.5.9 |
| mta | mta-solution-server-rhel9 | — | — |
| rhoai | odh-th06-cpu-torch210-py312-rhel9 | — | — |
| rhoai | odh-th06-cpu-torch291-py312-rhel9 | — | — |
| rhoai | odh-th06-cuda130-torch210-py312-rhel9 | — | — |
| rhoai | odh-th06-cuda130-torch291-py312-rhel9 | — | — |
| rhoai | odh-th06-rocm64-torch291-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-datascience-cpu-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-minimal-cpu-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-minimal-cuda-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-minimal-rocm-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-pytorch-cuda-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-pytorch-llmcompressor-cuda-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-pytorch-rocm-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-tensorflow-cuda-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-tensorflow-rocm-py312-rhel9 | — | — |
| rhoai | odh-workbench-jupyter-trustyai-cpu-py312-rhel9 | — | — |
CVSS provenance
nvdv3.16.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
nvdv4.05.1MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vendor_redhat6.1MEDIUM
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Red Hat
jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution
vendor_redhat·2026-08-01·CVSS 6.1
CVE-2026-67338 [MEDIUM] CWE-79 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution
jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution
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.
A flaw was found in JupyterLab. The Extension Manager fails to validate URI protocols in package metadata URLs. This allows attackers to publish malicious PyPI packages containing `javascript:` URLs in their project metadata. When a user clicks on the extension name, arbitrary JavaScript code can be executed within the JupyterLab environment,
VulDB
jupyter JupyterLab up to 4.5.8 Extension Manager cross site scripting (EUVD-2026-51849)
vuldb·2026-08-01·CVSS 6.1
CVE-2026-67338 [MEDIUM] jupyter JupyterLab up to 4.5.8 Extension Manager cross site scripting (EUVD-2026-51849)
A vulnerability was found in jupyter JupyterLab up to 4.5.8. It has been classified as problematic. This affects an unknown part of the component Extension Manager. Performing a manipulation results in cross site scripting.
This vulnerability is cataloged as CVE-2026-67338. It is possible to initiate the attack remotely. There is no exploit available.
Upgrading the affected component is recommended.
GHSA
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.
ghsa_unreviewed·2026-08-01
CVE-2026-67338 [MEDIUM] CWE-84 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.
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.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-67338 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution [fedora-all]
bugzilla·2026-08-05·CVSS 6.1
CVE-2026-67338 [MEDIUM] CVE-2026-67338 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution [fedora-all]
CVE-2026-67338 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-67338 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution [epel-all]
bugzilla·2026-08-05·CVSS 6.1
CVE-2026-67338 [MEDIUM] CVE-2026-67338 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution [epel-all]
CVE-2026-67338 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
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.
Bugzilla
CVE-2026-67338 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution
bugzilla·2026-08-01·CVSS 6.1
CVE-2026-67338 [MEDIUM] CVE-2026-67338 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution
CVE-2026-67338 jupyterlab: JupyterLab: Stored cross-site scripting in Extension Manager allows arbitrary code execution
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.
https://github.com/jupyterlab/jupyterlab/commit/4e61e07d0a91145b53fbf96ac74b0387f6bc51f6https://github.com/jupyterlab/jupyterlab/commit/d5d961f6e10a6442dddbf94d9a976b3897055a12https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-vmhf-c436-hxj4https://www.vulncheck.com/advisories/jupyterlab-before-stored-xss-via-extension-manager
2026-08-01
Published