CVE-2025-61669 Details
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.
An open redirection vulnerability has been identified in Jupyter Server versions through 2.17.0. The issue arises in the login process, where the 'next' query parameter is not properly validated. This flaw allows redirects to arbitrary external domains, which could be exploited for phishing attacks. The vulnerability is caused by insufficient validation in the 'LoginFormHandler._redirect_safe()' method, enabling attackers to craft login URLs that redirect users to malicious sites.
Users can upgrade to Jupyter Server version 2.18.0 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 5, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w | CISA-ADP | ExploitVendor Advisory |
| https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w | [email protected] | ExploitVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-601 | URL Redirection to Untrusted Site ('Open Redirect') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| jupyter jupyter server | < 2.18.0 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 11, 2026 | Initial Analysis | [email protected] |
| May 5, 2026 | CVE Modified | CISA-ADP |
| May 5, 2026 | New CVE Received | [email protected] |