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

11 May 2026, 13:01

Type	Values Removed	Values Added
References	~~() https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w -~~	() https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w - Exploit, Vendor Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~unknown~~	v2 : unknown v3 : 6.1
First Time		Jupyter Jupyter jupyter Server
CPE		cpe:2.3:a:jupyter:jupyter_server::::::::

05 May 2026, 21:16

Type	Values Removed	Values Added
References	~~() https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w -~~	() https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w -

05 May 2026, 16:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-05 16:16

Updated : 2026-05-11 13:01

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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