jupyter-server: Jupyter Server is the backend for Jupyter web applications
CVE-2025-61669 is fixed in jupyter-server on 1 platform by DEBIAN-CVE-2025-61669 (version 2.20.0-1), released May 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| jupyter-server · Debian 14 | 2.20.0-1 | DEBIAN-CVE-2025-61669 | May 5, 2026 |
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