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
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Meta Information
Published
2026-05-29
Last Modified
2026-06-01
Generated
2026-06-19
AI Q&A
2026-05-30
EPSS Evaluated
2026-06-18
NVD
CVE-2026-49384
EUVD
EUVD-2026-33392
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
jetbrains pycharm to 2025.3.4 (exc)
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Exploitability
CWE
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KEV
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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.
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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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