CVE-2026-49384
Stored XSS in JetBrains PyCharm Jupyter Notebook
Publication date: 2026-05-29
Last updated on: 2026-05-29
Assigner: JetBrains s.r.o.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| jetbrains | pycharm | to 2025.3.4 (exc) |
Helpful Resources
Exploitability
| 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
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.