CVE-2026-40934

Sažetak

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.

Reference

CVSS

Base:	6.8
Impact:	5.2
Exploitability:	1.6

Pristup

Vektor	Složenost	Autentikacija
NETWORK	HIGH	LOW

Impact

Povjerljivost	Cjelovitost	Dostupnost
HIGH	HIGH	NONE

CVSS vektor

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Zadnje važnije ažuriranje

11-05-2026 - 13:00

Objavljeno

05-05-2026 - 22:16