{"action":"No fix published. Pin and monitor.","affected":[{"introduced":"1.12.0","last_affected":"2.17.0"}],"component":"jupyter-server","cve_ids":["CVE-2026-6657"],"ecosystem":"PyPI","epss":0.05213,"exploited":false,"fixed_versions":[],"ghsa_id":"GHSA-v42x-x7jp-845h","id":"tcs_01M5KH5H4WT8Q4P1MAR21XQPNT","modified_at":"2026-07-23T15:00:15.106608390Z","published_at":"2026-07-23T11:41:37.761563Z","references":["https://osv.dev/vulnerability/PYSEC-2026-3472","https://nvd.nist.gov/vuln/detail/CVE-2026-6657","https://github.com/jupyter-server/jupyter_server","https://huntr.com/bounties/18f642db-3569-43b3-b58d-ff97be4b09d7","https://pypi.org/project/jupyter-server","https://github.com/advisories/GHSA-v42x-x7jp-845h"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"PYSEC-2026-3472","url":"https://osv.dev/vulnerability/PYSEC-2026-3472"}],"summary":"jupyter-server is vulnerable to CORS origin validation bypass when the `allow_origin_pat` configuration is used"}