CVE-2025-61669
6.1 · MEDIUMOverview
CVE-2025-61669 is a medium-severity vulnerability affecting jupyter jupyter_server. It was published on May 5, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from jupyter. Update jupyter_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| jupyter | jupyter_server | >= 0, < 2.18.0 | Affected |
Frequently Asked Questions
What is CVE-2025-61669?
CVE-2025-61669 is a medium-severity vulnerability affecting jupyter jupyter_server. It was published on May 5, 2026 and has a CVSS 3.1 base score of 6.1 (MEDIUM).
How severe is CVE-2025-61669?
This vulnerability has a CVSS 3.1 base score of 6.1, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-61669?
Check the references section for vendor advisories and patches from jupyter. Update jupyter_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-61669?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-61669 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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