{"action":"Upgrade jupyterlab to 4.5.7 or later.","affected":[{"fixed":"4.5.7","introduced":"4.0.0"}],"component":"jupyterlab","cve_ids":["CVE-2026-42266"],"ecosystem":"PyPI","epss":0.00852,"exploited":false,"fixed_versions":["4.5.7"],"ghsa_id":"GHSA-37w4-hwhx-4rc4","id":"tcs_01M5KEV8CDCTCMM8XRG481ZW8C","modified_at":"2026-09-10T03:51:04.397852198Z","published_at":"2026-05-05T20:53:18Z","references":["https://osv.dev/vulnerability/GHSA-37w4-hwhx-4rc4","https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-37w4-hwhx-4rc4","https://nvd.nist.gov/vuln/detail/CVE-2026-42266","https://github.com/jupyterlab/jupyterlab","https://github.com/jupyterlab/jupyterlab/releases/tag/v4.5.7","https://github.com/pypa/advisory-database/tree/main/vulns/jupyterlab/PYSEC-2026-164.yaml","https://jupyterhub.readthedocs.io/en/5.2.1/explanation/websecurity.html","https://jupyterlab.readthedocs.io/en/latest/user/extensions.html#extension-manager-implementations"],"severity":{"label":"high","score":8.8},"sources":[{"source":"osv","source_id":"GHSA-37w4-hwhx-4rc4","url":"https://osv.dev/vulnerability/GHSA-37w4-hwhx-4rc4"}],"summary":"JupyterLab has an Extension Manager API/GUI Policy Discrepancy, allowing 3rd party (malicious) extensions install via POST request"}