Description
jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. Prior to 4.5.10 and 4.6.2, in packages/imageviewer/src/widget.ts, JupyterLab's ImageViewer uses URL.createObjectURL for a specially crafted SVG image and revokes the blob URL too early, allowing the image to retain an executable same-origin context when it is opened through the image viewer and then opened in a new browser tab. The resulting cross-site scripting can be used to execute arbitrary code on the JupyterLab server. This issue is fixed in versions 4.5.10 and 4.6.2.
References10
- github.com/jupyterlab/jupyterlab/commit/9365f020baec5221deaf115…
- github.com/jupyterlab/jupyterlab/commit/be9303f5bcd5308eaeae953…
- github.com/jupyterlab/jupyterlab/commit/f1beab4a2027af4719d6edc…
- github.com/jupyterlab/jupyterlab/pull/19184
- github.com/jupyterlab/jupyterlab/pull/19185
- github.com/jupyterlab/jupyterlab/pull/19186
- github.com/jupyterlab/jupyterlab/releases/tag/v4.5.10
- github.com/jupyterlab/jupyterlab/releases/tag/v4.6.2
- github.com/jupyterlab/jupyterlab/releases/tag/v4.7.0a1
- github.com/jupyterlab/jupyterlab/security/advisories/GHSA-gx64-…
Metrics
- CVSS 4.0
-
7.5
HIGH
Score source: CNA
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/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 - EPSS — exploit probability
- 1% percentile: 55 · as of 12 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.