{"cve":"CVE-2026-102831","nvd":{"published":"2026-09-29T19:17:25.700","modified":"2026-10-02T13:17:27.660","status":"Awaiting Analysis","description":"JupyterLab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From JupyterLab 4.5.0 until 4.5.11 and 4.6.4, from Notebook 7.5.0 until 7.6.3, and from JupyterLite Core 0.7.0 until 0.8.4, the system clipboard cell-paste path accepts attacker-controlled cell JSON without clearing metadata.trusted. When useSystemClipboardForCells is active and pasteCodeCellsWithoutOutput is disabled, a pasted code cell can mark HTML output as trusted, bypass output sanitization, and execute script in the authenticated JupyterLab origin without executing the cell. Markdown and raw cells are not affected because their output is sanitized. This issue is fixed in JupyterLab 4.5.11 and 4.6.4, Notebook 7.6.3, and JupyterLite Core 0.8.4.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N","score":8.1},"cwes":["CWE-79","CWE-345"],"references":["https://github.com/jupyterlab/jupyterlab/commit/1a10a7da5ff655849b21581c2633b46483ae0be9","https://github.com/jupyterlab/jupyterlab/commit/7f9f29e29e0c83fb17b0f11da57d06b3c6a40d96","https://github.com/jupyterlab/jupyterlab/commit/cf6e89a8d315c4134cefa50c220bca296da466a7","https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.11","https://github.com/jupyterlab/jupyterlab/releases/tag/v4.6.4"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:48.555445741+00:00"},"epss":{"cve":"CVE-2026-102831","score":0.00193,"percentile":0.08911,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-6966-vjj6-99xv","url":"https://osv.dev/vulnerability/GHSA-6966-vjj6-99xv","summary":"JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard","modified":"2026-10-01T17:56:16.052628472Z","packages":[{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=4.6.0 <4.6.4"],"fixed":["4.6.4"]},{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=4.5.0 <4.5.11"],"fixed":["4.5.11"]},{"ecosystem":"PyPI","name":"notebook","purl":"pkg:pypi/notebook","ranges":[">=7.5.0 <7.6.3"],"fixed":["7.6.3"]},{"ecosystem":"PyPI","name":"jupyterlite","purl":"pkg:pypi/jupyterlite","ranges":[">=0.7.0 <0.8.4"],"fixed":["0.8.4"]},{"ecosystem":"PyPI","name":"jupyterlite-core","purl":"pkg:pypi/jupyterlite-core","ranges":[">=0.7.0 <0.8.4"],"fixed":["0.8.4"]}]},{"id":"PYSEC-2026-4057","url":"https://osv.dev/vulnerability/PYSEC-2026-4057","summary":"JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard","modified":"2026-10-01T17:56:16.052628472Z","packages":[{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=4.5.0 <4.5.11",">=4.6.0 <4.6.4"],"fixed":["4.5.11","4.6.4"]}]},{"id":"PYSEC-2026-4058","url":"https://osv.dev/vulnerability/PYSEC-2026-4058","summary":"JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard","modified":"2026-10-01T17:56:16.052628472Z","packages":[{"ecosystem":"PyPI","name":"jupyterlite","purl":"pkg:pypi/jupyterlite","ranges":[">=0.7.0 <0.8.4"],"fixed":["0.8.4"]}]},{"id":"PYSEC-2026-4060","url":"https://osv.dev/vulnerability/PYSEC-2026-4060","summary":"JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard","modified":"2026-10-01T17:56:16.052628472Z","packages":[{"ecosystem":"PyPI","name":"jupyterlite-core","purl":"pkg:pypi/jupyterlite-core","ranges":[">=0.7.0 <0.8.4"],"fixed":["0.8.4"]}]},{"id":"PYSEC-2026-4112","url":"https://osv.dev/vulnerability/PYSEC-2026-4112","summary":"JupyterLab: Cross-site scripting (XSS) in JupyterLab via notebook cells pasted from the system clipboard","modified":"2026-10-05T06:30:02.388571428Z","packages":[{"ecosystem":"PyPI","name":"notebook","purl":"pkg:pypi/notebook","ranges":[">=7.5.0 <7.6.3"],"fixed":["7.6.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}