cvedb.io
CVE-2025-61669
MEDIUM · CVSS 6.1
EPSS exploitation probability: 0%
Published 2026-05-05T16:16:10.133 · Last modified 2026-06-17T09:50:45.103

Summary

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.

Affected products

jupyter — jupyter_server

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.