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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact High

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
jupyter-server jupyter_server affected
Version Status Constraints
<= 2.17.0 affected —

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-qh7q-6qm3-653w Jupyter Server has an open redirection vulnerability in `next` query parameter
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/jupyter-server/jupyter_server/security/advisories/GHSA-qh7q-6qm3-653w cve-icon cve-icon
History

Tue, 05 May 2026 16:15:00 +0000

Type Values Removed Values Added
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.
Title jupyter_server next parameter open redirect can redirect users to external domains
Weaknesses CWE-601
References
Metrics cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-05T15:28:43.833Z

Reserved: 2025-09-29T20:25:16.180Z

Link: CVE-2025-61669

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-05T16:16:10.133

Modified: 2026-05-05T16:16:10.133

Link: CVE-2025-61669

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-05T17:30:05Z

Weaknesses