CVE-2025-61669

Name	CVE-2025-61669
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
jupyter-server (PTS)	bullseye	1.2.2-1	vulnerable
	bookworm	1.23.3-1	vulnerable
	trixie	2.15.0-1	vulnerable
	forky, sid	2.17.0-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
jupyter-server	source	(unstable)	(unfixed)

https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w