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CVE-2025-61669— jupyter_server next parameter open redirect can redirect users to external domains

Quick assessment

Affected
jupyter-server jupyter_server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Jupyter Server是Jupyter组织的一款用于为Jupyter Web应用提供后端服务的应用软件。 Jupyter Server 2.17.0及之前版本存在输入验证错误漏洞，该漏洞源于登录流程中next查询参数验证不足，可能导致重定向到任意外部域，攻击者可通过特制登录URL将用户重定向到恶意站点并促进钓鱼攻击。

AI Predicted 6.1 Difficulty: Easy EPSS 0.27% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
jupyter-server jupyter_server <= 2.17.0 affected
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I. Basic Information for CVE-2025-61669

Vulnerability Information
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Vulnerability Title
jupyter_server next parameter open redirect can redirect users to external domains
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Jupyter Server 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jupyter Server是Jupyter组织的一款用于为Jupyter Web应用提供后端服务的应用软件。 Jupyter Server 2.17.0及之前版本存在输入验证错误漏洞，该漏洞源于登录流程中next查询参数验证不足，可能导致重定向到任意外部域，攻击者可通过特制登录URL将用户重定向到恶意站点并促进钓鱼攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
jupyter-server jupyter_server <= 2.17.0 -

II. Public POCs for CVE-2025-61669

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III. Intelligence Information for CVE-2025-61669

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Vendor Advisories for CVE-2025-61669 (1)

Same Patch Batch · jupyter-server · 2026-05-05 · 4 CVEs total

CVE-2026-35397 7.6 HIGH jupyter-server path traversal allows access to sibling directories sharing root_dir name p
CVE-2026-40110 jupyter-server CORS origin validation bypass via unanchored regex in allow_origin_pat
CVE-2026-40934 jupyter-server authentication cookies remain valid after password reset due to static cook

IV. Related Vulnerabilities

Same product: jupyter_server
Same vendor: jupyter-server
Same weakness: CWE-601

V. Comments for CVE-2025-61669

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