Security Advisory

CVE-2025-61669

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-05 15:28:43

Last updated 2026-05-05 20:16:59

Assigner GitHub_M

CVSS score 6.3

State PUBLISHED

Description

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.

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