CVE-2026-49384

Analyzed Analyzed - Analysis Complete

Stored XSS in JetBrains PyCharm Jupyter Notebook

Publication date: 2026-05-29

Last updated on: 2026-06-01

Assigner: JetBrains s.r.o.

Description

In JetBrains PyCharm before 2025.3.4 stored XSS in Jupyter notebook Markdown cells was possible

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-29

Last Modified

2026-06-01

Generated

2026-07-09

AI Q&A

2026-05-30

EPSS Evaluated

2026-07-08

NVD

CVE-2026-49384

EUVD

EUVD-2026-33392

Affected Vendors & Products

Vendor	Product	Version / Range
jetbrains	pycharm	to 2025.3.4 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Mitigation Strategies

To mitigate this vulnerability, update JetBrains PyCharm to version 2025.3.4 or later, as the issue with stored XSS in Jupyter notebook Markdown cells has been fixed in that release.

Executive Summary

This vulnerability is a stored Cross-Site Scripting (XSS) issue found in JetBrains PyCharm versions before 2025.3.4. It occurs specifically in Jupyter notebook Markdown cells, where malicious scripts can be stored and later executed when the notebook is viewed.

Impact Analysis

The impact of this vulnerability includes the potential for an attacker to execute malicious scripts in the context of the affected application. This can lead to unauthorized actions such as data theft, session hijacking, or manipulation of notebook content. The CVSS score indicates a moderate severity with possible impacts on confidentiality and integrity.

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