{"cve":"CVE-2026-73417","nvd":{"published":"2026-08-13T22:17:26.133","modified":"2026-09-18T20:05:53.723","status":"Awaiting Analysis","description":"jupyterlab is an extensible environment for interactive and reproducible computing, based on the Jupyter Notebook Architecture. From 3.3.0 until 4.5.10 and 4.6.2, JupyterLab allows notebook settings to be shared and applied through an overrides.json file using the Import button in the Settings Editor. In packages/notebook-extension/schema/tracker.json and packages/notebook-extension/src/index.ts, the sideBySideLeftMarginOverride and sideBySideRightMarginOverride settings are not properly validated before being inserted into style content, allowing a crafted settings file to contain instructions that execute as code instead of only changing display preferences. A user can import the malicious file, or an attacker with access to a shared settings location can plant an overrides.json that is applied automatically. The embedded code runs with the affected user's access and can read or modify notebooks and files and run code through the notebook server, including on a connected kernel. This issue is fixed in versions 4.5.10 and 4.6.2.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:L/SC:N/SI:N/SA:L","score":8.6},"cvss_v3":null,"cwes":["CWE-79","CWE-116"],"references":["https://github.com/jupyterlab/jupyterlab/commit/9365f020baec5221deaf11535ed554c06637c999","https://github.com/jupyterlab/jupyterlab/commit/be9303f5bcd5308eaeae953c5a3c903046682c2c","https://github.com/jupyterlab/jupyterlab/commit/f1beab4a2027af4719d6edc07d52d6cf5a39a432","https://github.com/jupyterlab/jupyterlab/pull/19184","https://github.com/jupyterlab/jupyterlab/pull/19185"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:48:17.459049833+00:00"},"epss":{"cve":"CVE-2026-73417","score":0.00748,"percentile":0.54892,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-pppj-hq3g-57pj","url":"https://osv.dev/vulnerability/GHSA-pppj-hq3g-57pj","summary":"JupyterLab: Cross-site scripting (XSS) via crafted settings file (`overrides.json`)","modified":"2026-09-10T03:50:52.917374928Z","packages":[{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=4.6.0 <4.6.2"],"fixed":["4.6.2"]},{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=3.3.0 <4.5.10"],"fixed":["4.5.10"]}]},{"id":"PYSEC-2026-3672","url":"https://osv.dev/vulnerability/PYSEC-2026-3672","summary":"JupyterLab: Cross-site scripting (XSS) via crafted settings file (`overrides.json`)","modified":"2026-08-19T12:55:29.965428984Z","packages":[{"ecosystem":"PyPI","name":"jupyterlab","purl":"pkg:pypi/jupyterlab","ranges":[">=3.3.0 <4.5.10",">=4.6.0 <4.6.2"],"fixed":["4.5.10","4.6.2"]}]}],"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."]}