CVE-2025-61669 - CVE House
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Status published Medium CVE-2025-61669

jupyter_server next parameter open redirect can redirect users to external domains

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

jupyter-server

View all reports →

Affected Software

jupyter_server
Vulnerable Versions:
<= 2.17.0

Timeline

Official Publish: May 5th, 2026
Last Modified: May 5th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-601

MITRE ATT&CK TTPs

T1566 Phishing
Initial Access
T1204 User Execution
Execution
T1071 Application Layer Protocol
Command and Control
T1189 Drive-by Compromise
Initial Access
T1036 Masquerading
Defense Evasion