Bug 2466810 (CVE-2025-61669) - CVE-2025-61669 jupyter_server: Jupyter Server: Redirects to arbitrary external domains via insufficient validation of login parameter
Summary: CVE-2025-61669 jupyter_server: Jupyter Server: Redirects to arbitrary externa...
Keywords:
Status: NEW
Alias: CVE-2025-61669
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-05 17:03 UTC by OSIDB Bzimport
Modified: 2026-05-15 13:36 UTC (History)
3 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-05-05 17:03:43 UTC 
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.
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