{"action":"Upgrade jupyterlab to 4.5.7 or later.","affected":[{"fixed":"4.5.7","introduced":"0"}],"component":"jupyterlab","cve_ids":["CVE-2026-42557"],"ecosystem":"PyPI","epss":0.00371,"exploited":false,"fixed_versions":["4.5.7"],"ghsa_id":"GHSA-mqcg-5x36-vfcg","id":"tcs_01M5KFRH58DWHXC0HS09Z0W5YD","modified_at":"2026-09-10T03:51:06.550584406Z","published_at":"2026-05-06T21:43:44Z","references":["https://osv.dev/vulnerability/GHSA-mqcg-5x36-vfcg","https://github.com/jupyterlab/jupyterlab/security/advisories/GHSA-mqcg-5x36-vfcg","https://nvd.nist.gov/vuln/detail/CVE-2026-42557","https://github.com/jupyterlab/jupyterlab","https://jupyterlab.readthedocs.io/en/latest/user/commands.html#commands-in-markdown-files"],"severity":{"label":"critical","score":9.6},"sources":[{"source":"osv","source_id":"GHSA-mqcg-5x36-vfcg","url":"https://osv.dev/vulnerability/GHSA-mqcg-5x36-vfcg"}],"summary":"JupyterLab's command linker attributes in HTML enable one-click command execution from untrusted content"}