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CVE-2021-32862— nbconvert vulnerable to cross-site scripting (XSS) via multiple exploit paths

Quick assessment

Affected
jupyter nbconvert
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.

nbconvert是Project Jupyter开源的一个格式转换库。将 Jupyter .ipynb 笔记本文档文件转换为另一种静态格式，包括 HTML、LaTeX、PDF、Markdown 等。 nbconvert 6.3之前版本存在跨站脚本漏洞，该漏洞源于当使用nbconvert生成用户可控笔记本的HTML版本时，如果这些HTML笔记本由Web服务器（例如：nbviewer）提供服务，有可能注入任意的HTML，从而导致跨站脚本（XSS）漏洞。

CVSS 7.5 · High EPSS 1.38% · P71

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter
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I. Basic Information for CVE-2021-32862

Vulnerability Information
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Vulnerability Title
nbconvert vulnerable to cross-site scripting (XSS) via multiple exploit paths
Source: CVE Program / CVE List V5
Vulnerability Description
The GitHub Security Lab discovered sixteen ways to exploit a cross-site scripting vulnerability in nbconvert. When using nbconvert to generate an HTML version of a user-controllable notebook, it is possible to inject arbitrary HTML which may lead to cross-site scripting (XSS) vulnerabilities if these HTML notebooks are served by a web server (eg: nbviewer).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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
nbconvert 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nbconvert是Project Jupyter开源的一个格式转换库。将 Jupyter .ipynb 笔记本文档文件转换为另一种静态格式，包括 HTML、LaTeX、PDF、Markdown 等。 nbconvert 6.3之前版本存在跨站脚本漏洞，该漏洞源于当使用nbconvert生成用户可控笔记本的HTML版本时，如果这些HTML笔记本由Web服务器（例如：nbviewer）提供服务，有可能注入任意的HTML，从而导致跨站脚本（XSS）漏洞。
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 nbconvert <= 6.2 -

II. Public POCs for CVE-2021-32862

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III. Intelligence Information for CVE-2021-32862

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Vendor Advisories for CVE-2021-32862 (2)

Mailing List Discussions for CVE-2021-32862 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2021-32862

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