{"action":"Upgrade jupyterhub to 5.4.5 or later.","affected":[{"fixed":"5.4.5","introduced":"4.1.0"}],"component":"jupyterhub","cve_ids":["CVE-2026-40864"],"ecosystem":"PyPI","epss":0.00146,"exploited":false,"fixed_versions":["5.4.5"],"ghsa_id":"GHSA-m68r-v472-jgq9","id":"tcs_01M5KFQCPZXVFMEMT57Y6516R1","modified_at":"2026-09-10T03:51:06.307577438Z","published_at":"2026-05-05T18:10:58Z","references":["https://osv.dev/vulnerability/GHSA-m68r-v472-jgq9","https://github.com/jupyterhub/jupyterhub/security/advisories/GHSA-m68r-v472-jgq9","https://nvd.nist.gov/vuln/detail/CVE-2026-40864","https://github.com/jupyterhub/jupyterhub/commit/9c5ec277d3cda5a59de2d8c8117efa77bd941127","https://github.com/jupyterhub/jupyterhub"],"severity":{"label":"medium","score":5.4},"sources":[{"source":"osv","source_id":"GHSA-m68r-v472-jgq9","url":"https://osv.dev/vulnerability/GHSA-m68r-v472-jgq9"}],"summary":"JupyterHub has cross-origin form POSTs bypass XSRF (CWE-352)"}