CVE-2025-61669

Jupyter Server is the backend for Jupyter web applications. In jupyter_server versions through 2.17.0, the next query parameter in the login flow is insufficiently validated in `LoginFormHandler._redirect_safe()`, which allows redirects to arbitrary external domains via values such as `///example.com`. An attacker can use a crafted login URL to redirect users to a malicious site and facilitate phishing attacks. This issue is fixed in version 2.18.0.

CVSS v3 6.1 MEDIUM

6.1^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w	Exploit Vendor Advisory
https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:jupyter:jupyter_server:*:*:*:*:*:*:*:*

History

30 Sep 2026, 22:10

Type	Values Removed	Values Added
Summary		(es) Jupyter Server es el backend para las aplicaciones web de Jupyter. En las versiones de jupyter_server hasta la 2.17.0, el parámetro de consulta next en el flujo de inicio de sesión está insuficientemente validado en 'LoginFormHandler._redirect_safe()', lo que permite redirecciones a dominios externos arbitrarios a través de valores como '///example.com'. Un atacante puede usar una URL de inicio de sesión manipulada para redirigir a los usuarios a un sitio malicioso y facilitar ataques de phishing. Este problema se corrige en la versión 2.18.0.

Information

Published : 2026-05-05 16:16

Updated : 2026-10-07 09:10

NVD link : CVE-2025-61669

Mitre link : CVE-2025-61669

CVE.ORG link : CVE-2025-61669

JSON object : View

Products Affected

jupyter

jupyter_server

CWE

CWE-601

URL Redirection to Untrusted Site ('Open Redirect')

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