| 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) |
| Debian Bugs | 1136022 |
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 | 2.20.0-3 | fixed |
The information below is based on the following data on fixed versions.
Notes
[trixie] - jupyter-server <no-dsa> (Minor issue)
[bookworm] - jupyter-server <postponed> (Minor issue; _redirect_safe next-param open redirect present, revisit with next update)
[bullseye] - jupyter-server <postponed> (Minor issue; _redirect_safe next-param open redirect present, revisit with next update)
https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w