CVE-2021-32862
The GitHub Security Lab discovered sixteen ways to exploit a cross-site scripting vulnerability in nbconvert.
Does this matter?
Lower severity and a low EPSS score (1.48%). Track it; it rarely justifies an emergency change on its own.
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).
- CVSS 3.1
- 5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.48% probability · 74th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-79
- Affected
- jupyter/nbconvert · debian/debian linux
- Source
- security-advisories@github.com
EPSS 1.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.