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JetBrains PyCharm Stored Cross-Site Scripting Vulnerability in Jupyter Notebook Markdown Cells

Vulnerability

A stored cross-site scripting vulnerability has been identified in JetBrains PyCharm versions prior to 2025.3.4. This issue allows for the injection of malicious scripts into Jupyter notebook Markdown cells, which are then executed when the notebook is viewed.

Impact

Exploitation of this vulnerability allows for stored cross-site scripting, where injected scripts are executed in the context of the user viewing the notebook.

Remediation

Users can update to JetBrains PyCharm version 2025.3.4 or later to address this vulnerability.

Added: May 29, 2026, 7:23 PM
Updated: May 29, 2026, 7:23 PM

Vulnerability Rating

Custom Algorithm
spread
5.4
impact
1.3
exploitability
4.4
remediation
7.7
relevance
9.6
threat
0.0
urgency
2.9
incentive
0.0

Our algorithm analyzes dozens of metrics to generate these 8 key vulnerability categories, which are then combined to calculate the overall risk score.