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CVE-2026-6657— CORS Origin Validation Bypass in jupyter-server

Quick assessment

Affected
jupyter jupyter/jupyter
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 1.12.0版本至2.17.0版本存在安全漏洞，该漏洞源于CORS源验证使用re.match导致绕过，可能导致网络钓鱼攻击和未授权访问。

AI Predicted 7.5 Difficulty: Easy EPSS 0.27% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
jupyter jupyter/jupyter unspecified≤ latest affected
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I. Basic Information for CVE-2026-6657

Vulnerability Information
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Vulnerability Title
CORS Origin Validation Bypass in jupyter-server
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in jupyter-server versions 1.12.0 through 2.17.0 allows an attacker to bypass CORS origin validation when the `allow_origin_pat` configuration is used. The issue arises from the use of `re.match()` for validating the `Origin` header, which only anchors at the start of the string. This allows attacker-controlled domains such as `trusted.example.com.evil.com` to pass validation against patterns intended to match `trusted.example.com`. The vulnerability affects multiple locations in the codebase, including CORS headers, WebSocket connections, referer validation, and login redirects, potentially enabling phishing attacks, arbitrary code execution, and unauthorized access to sensitive API responses.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Jupyter Server 安全漏洞
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 1.12.0版本至2.17.0版本存在安全漏洞，该漏洞源于CORS源验证使用re.match导致绕过，可能导致网络钓鱼攻击和未授权访问。
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 jupyter/jupyter unspecified ~ latest -

II. Public POCs for CVE-2026-6657

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III. Intelligence Information for CVE-2026-6657

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Vendor Advisories for CVE-2026-6657 (1)

IV. Related Vulnerabilities

Same product: jupyter/jupyter
Same vendor: jupyter
Same weakness: CWE-346

V. Comments for CVE-2026-6657

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