CVE-2021-32862

MediumCVSS 5.4/10Last modified Jun 17, 2026

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).

Metrics

CVSS 3.1 5.4/10CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
jupyter	nbconvert	<= 6.2

References

https://github.com/jupyter/nbconvert/security/advisories/GHSA-9jmq-rx5f-8jwqExploit, Third Party Advisory
https://github.com/jupyter/nbviewer/security/advisories/GHSA-h274-fcvj-h2wmBroken Link
https://lists.debian.org/debian-lts-announce/2023/06/msg00003.htmlMailing List, Third Party Advisory
https://github.com/jupyter/nbconvert/security/advisories/GHSA-9jmq-rx5f-8jwqExploit, Third Party Advisory
https://github.com/jupyter/nbviewer/security/advisories/GHSA-h274-fcvj-h2wmBroken Link
https://lists.debian.org/debian-lts-announce/2023/06/msg00003.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2024/09/msg00004.html

Timeline

Published: Aug 18, 2022
Last modified: Jun 17, 2026
NVD status: Modified

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