{"schemaVersion":3,"id":"CVE-2026-40934","aliases":["GHSA-5mrq-x3x5-8v8f","PYSEC-2026-69","UBUNTU-CVE-2026-40934","DEBIAN-CVE-2026-40934","CGA-2c24-vvf4-vm79","CGA-5pq6-cxc6-vf8f","CGA-6qcj-j3c9-34r9","CGA-hpq6-x2q5-w49q"],"status":"published","duplicateOf":null,"title":null,"description":"Jupyter Server is the backend for Jupyter web applications. In versions 2.17.0 and earlier, the secret used to sign authentication cookies is persisted to a static file at ~/.local/share/jupyter/runtime/jupyter_cookie_secret and is never rotated when a user changes their password. After a password reset and server restart, any previously issued authentication cookie remains cryptographically valid because the signing key has not changed. An attacker who has captured a session cookie through any means retains full authenticated access to the server regardless of subsequent password changes. This affects deployments using password-based authentication, particularly shared or public-facing servers where credential rotation is expected to revoke existing sessions. This issue has been fixed in version 2.18.0.","dates":{"published":"2026-05-05T21:31:42.897Z","modified":"2026-05-07T12:48:21.223Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.6,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":7.6,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Pypi","score":6.8,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","exploitability":4.1,"impact":8.7,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · 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