Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
JupyterLab versions 4.5.0 through 4.6.3 (and applications bundling them, such as Notebook 7.5+) are vulnerable to cross-site scripting when cells are pasted from the system clipboard. An attacker who controls clipboard text can supply a cell whose output is marked trusted, so a script runs in the JupyterLab origin on paste, with the user's server API access. Upgrade the jupyterlab package to 4.6.4 or 4.5.11. If you are on 4.5.2 or later, keep the system clipboard for cells disabled, which is the default.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.1 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0024, the 14th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:09 UTC First seen by agentprime
- 31 Oct 2026, 14:09 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-6966-vjj6-99xv
- OSV: GHSA-6966-vjj6-99xv
- github.com/jupyterlab/jupyterlab/security/advisories/GHSA-6966-vjj6-99xv
- nvd.nist.gov/vuln/detail/CVE-2026-102831
- github.com/jupyterlab/jupyterlab/commit/1a10a7da5ff655849b21581c2633b46483ae0be9
- github.com/jupyterlab/jupyterlab/commit/7f9f29e29e0c83fb17b0f11da57d06b3c6a40d96
- github.com/jupyterlab/jupyterlab/commit/cf6e89a8d315c4134cefa50c220bca296da466a7
- github.com/jupyterlab/jupyterlab
- github.com/jupyterlab/jupyterlab/releases/tag/v4.5.11
- github.com/jupyterlab/jupyterlab/releases/tag/v4.6.4
- pypi.org/project/notebook
- github.com/advisories/GHSA-6966-vjj6-99xv