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CVE-2021-32862

20
FAUCET Score

CVE-2021-32862 describes a cross-site scripting (XSS) vulnerability in nbconvert, affecting Debian Linux and Jupyter nbconvert. This flaw allows an attacker to inject arbitrary HTML when converting user-controlled notebooks to HTML, potentially leading to XSS if these generated files are hosted on a web server. With a CVSS score of 5.4 (Medium), exploitation requires user interaction and low privileges, resulting in low impact to confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.2.0CPE matchmatch criteria
cpe:2.3:a:jupyter:nbconvert:*:*:*:*:*:python:*:*
10.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.11%
Probability of exploitation in next 30 days
EPSS Percentile
62.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0111 is in the 94th percentile among its peer group of 15,239 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

pippatch availablevia ghsa
Product: nbconvertFixed in: 6.5.1

Vendor Advisories (1)

pipGHSA-9jmq-rx5f-8jwqmedium

nbconvert vulnerable to cross-site scripting (XSS) via multiple exploit paths

Aug 10, 2022

References

lists.debian.org / debian-lts-announce/2024/09/msg00004.html
github.com / jupyter/nbconvert/security/advisories/GHSA-9jmq-rx5f-8jwq
ExploitThird Party Advisory
github.com / jupyter/nbviewer/security/advisories/GHSA-h274-fcvj-h2wm
Broken Link
lists.debian.org / debian-lts-announce/2023/06/msg00003.html
Mailing ListThird Party Advisory