Open Redirect Affecting jupyter-server package, versions [,2.18.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-JUPYTERSERVER-16425697
- published6 May 2026
- disclosed5 May 2026
- creditniwasak1
Introduced: 5 May 2026
CVE-2025-61669 (opens in a new tab)How to fix?
Upgrade jupyter-server to version 2.18.0 or higher.
Overview
Affected versions of this package are vulnerable to Open Redirect through the LoginFormHandler in the login handler. An attacker can send a crafted /login request with a protocol-relative redirect target beginning with // to make the application redirect a victim to an external site after login. This can be used for phishing and to send users away from the trusted Jupyter interface to attacker-controlled content.