{"id":"PYSEC-2026-1706","summary":"JupyterLab vulnerable to potential authentication and CSRF tokens leak","details":"### Impact\nUsers of JupyterLab who click on a malicious link may get their `Authorization` and `XSRFToken` tokens exposed to a third party when running an older `jupyter-server` version.\n\n### Patches\nJupyterLab 4.1.0b2, 4.0.11, and 3.6.7 were patched.\n\n### Workarounds\nNo workaround has been identified, however users should ensure to upgrade `jupyter-server` to version 2.7.2 or newer which includes a redirect vulnerability fix.\n\n### References\n\nVulnerability reported by user @davwwwx via the [bug bounty program](https://app.intigriti.com/programs/jupyter/jupyter/detail) [sponsored by the European Commission](https://commission.europa.eu/news/european-commissions-open-source-programme-office-starts-bug-bounties-2022-01-19_en) and hosted on the [Intigriti platform](https://www.intigriti.com/).\n","aliases":["BIT-jupyter-base-notebook-2024-22421","BIT-jupyter-notebook-2024-22421","BIT-jupyterlab-2024-22421","CVE-2024-22421","GHSA-44cc-43rp-5947","PYSEC-2026-2534"],"modified":"2026-07-13T16:42:58.393120611Z","published":"2026-07-07T11:45:30.889714Z","references":[{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-44cc-43rp-5947"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-22421"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/commit/19bd9b96cb2e77170a67e43121637d0b5619e8c6"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/commit/1ef7a4fa0202ebdf663e1cc0b45c8813a34a0b96"},{"type":"WEB","url":"https://github.com/jupyterlab/jupyterlab/commit/fccd83dc4441da0384ee3fd1322c3b2d9ad4caaa"},{"type":"PACKAGE","url":"https://github.com/jupyterlab/jupyterlab"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UQJKNRDRFMKGVRIYNNN6CKMNJDNYWO2H"},{"type":"PACKAGE","url":"https://pypi.org/project/notebook"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-44cc-43rp-5947"}],"affected":[{"package":{"name":"notebook","ecosystem":"PyPI","purl":"pkg:pypi/notebook"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.0"},{"fixed":"7.0.7"}]}],"versions":["7.0.0","7.0.1","7.0.2","7.0.3","7.0.4","7.0.5","7.0.6"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/notebook/PYSEC-2026-1706.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:L"}]}