CVE-2024-22420Network attack vector

User data access via unsanitized Markdown headings

Published Jan 19, 2024 · Updated May 30, 2025

Stored cross-site scripting in JupyterLab 4.0.0 through 4.0.10 allows remote attackers to access user data through a malicious Markdown file. The table-of-contents getHeadingId path assigns unsanitized Markdown parser output to innerHTML and builds selectors from unescaped heading IDs. Execution requires a user to open the crafted file in Markdown Preview while the table-of-contents extension is enabled, after which attacker-controlled script can issue requests with that user's access.

CVSS severity6.5
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in JupyterLab 4.0.0 through 4.0.10 allows remote attackers to access user data through a malicious Markdown file. The table-of-contents getHeadingId path assigns unsanitized Markdown parser output to innerHTML and builds selectors from unescaped heading IDs. Execution requires a user to open the crafted file in Markdown Preview while the table-of-contents extension is enabled, after which attacker-controlled script can issue requests with that user's access.

The record

CVE
CVE-2024-22420
Published
Jan 19, 2024
Updated
May 30, 2025
Vendor
Project Jupyter
Product
JupyterLab
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2024CVE publishedPublication date reported by the CVE source.
  2. May 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>=4.0.0, < 4.0.11

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Project Jupyter · JupyterLabversion=>=4.0.0, < 4.0.11

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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