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CVE-2026-6658— Cross-site Scripting (XSS) in jupyter/nbconvert

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 nbconvert是Jupyter组织的一个将文件转换为各种静态格式的工具。 Jupyter nbconvert 7.17.0及之前版本存在跨站脚本漏洞，该漏洞源于在HTML导出中未对 输出进行清理，可能允许跨站脚本攻击。

AI Predicted 7.5 Difficulty: Easy EPSS 0.23% · P12

Affected Version Matrix 1

VendorProduct Version RangeStatus
jupyter jupyter/jupyter unspecified≤ latest affected
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I. Basic Information for CVE-2026-6658

Vulnerability Information
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Vulnerability Title
Cross-site Scripting (XSS) in jupyter/nbconvert
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability in jupyter/nbconvert versions <= 7.17.0 allows for Cross-site Scripting (XSS) via unsanitized `text/vnd.mermaid` output in HTML exports. The `data_mermaid` block in `share/templates/lab/base.html.j2` renders `text/vnd.mermaid` cell output directly into HTML without escaping, enabling attackers to inject arbitrary HTML/JavaScript by breaking out of the `<pre>` tag. This vulnerability impacts any server using nbconvert to render notebooks as HTML, allowing attackers to execute arbitrary JavaScript in the context of users viewing the HTML export.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Jupyter nbconvert 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Jupyter nbconvert是Jupyter组织的一个将文件转换为各种静态格式的工具。 Jupyter nbconvert 7.17.0及之前版本存在跨站脚本漏洞，该漏洞源于在HTML导出中未对`text/vnd.mermaid`输出进行清理，可能允许跨站脚本攻击。
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 jupyter/jupyter unspecified ~ latest -

II. Public POCs for CVE-2026-6658

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III. Intelligence Information for CVE-2026-6658

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Vendor Advisories for CVE-2026-6658 (1)

IV. Related Vulnerabilities

Same product: jupyter/jupyter
Same vendor: jupyter
Same weakness: CWE-79

V. Comments for CVE-2026-6658

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