Pycharm
CVE-2026-25847
HIGH
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain
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AccessCraft malicious Jupyter notebook with XSS payload
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DeliveryHost notebook accessible to target
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ExploitUser opens notebook in PyCharm Jupyter viewer
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ExecutionJavaScript executes in browser context
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ImpactAccess sensitive data or modify content
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK
2 techniques across 2 tactics: Initial Access, Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Exploitation Conditions | PyCharm versions before 2025.3.2 with Jupyter viewer enabled. User must open a malicious Jupyter notebook file (.ipynb) containing crafted XSS payload in the integrated viewer. No authentication required for initial file access. |
| Impact | CVSS 8.2 (HIGH). Attack vector: Network. Complexity: High. Privileges required: None. User interaction: Required. |
| Exploit ScenarioDerived | An attacker could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
In JetBrains PyCharm before 2025.3.2 a DOM-based XSS on Jupyter viewer page was possible [CVSS 8.2 HIGH]
RemediationAI
Monitor vendor advisories for a patch. Implement output encoding and Content Security Policy headers. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-79 (Cross-site Scripting (XSS)). Affects Pycharm. In JetBrains PyCharm before 2025.3.2 a DOM-based XSS on Jupyter viewer page was possible
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
DescriptionCVE.org
In JetBrains PyCharm before 2025.3.2 a DOM-based XSS on Jupyter viewer page was possible
Executive ViewAI
JetBrains PyCharm versions prior to 2025.3.2 contain a DOM-based cross-site scripting (XSS) vulnerability in the Jupyter viewer that could allow attackers to execute arbitrary code in users' browsers. Organizations using PyCharm for data science and notebook development face potential credential theft, malware injection, and unauthorized access to sensitive research or proprietary data through compromised Jupyter sessions.
Until vendor patch is available: (1) Disable or restrict access to the Jupyter viewer feature in PyCharm through group policy or configuration management; (2) Implement network segmentation to limit Jupyter notebook sources to internal, trusted servers only; (3) Enforce user awareness training on not opening Jupyter notebooks from untrusted sources; (4) Monitor PyCharm process execution for suspicious activity; (5) Consider restricting PyCharm usage to isolated development environments until patched.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.
Affected Products (CPE)CVE.org
In JetBrains PyCharm 2019.2.5 and 2019.3 on Windows, Apple Notarization Service credentials were included. Rated high se
Arbitrary code execution in JetBrains PyCharm before 2026.1.4 and 2026.2 lets an attacker who supplies a crafted project
Code execution in JetBrains PyCharm before 2026.2.1 is possible through Jupyter MCP (Model Context Protocol) tools that
The embedded browser in JetBrains desktop IDEs - IntelliJ IDEA, PyCharm, PhpStorm, RubyMine, WebStorm, GoLand, Rider, CL
In JetBrains PyCharm before 2020.3.4, local code execution was possible because of insufficient checks when getting the
In JetBrains Rider before 2022.1 local code execution via links in ReSharper Quick Documentation was possible. Rated hig
GitHub access token could be exposed to third-party sites in JetBrains IDEs after version 2023.1 and less than: IntelliJ
JetBrains PyCharm before 2019.2 was allocating a buffer of unknown size for one of the connection processes. Rated high
Stored XSS in JetBrains PyCharm's Jupyter notebook Markdown cell renderer allows a remote, unauthenticated attacker to e
Cross-site scripting in JetBrains PyCharm's Quick Documentation rendering feature (before version 2026.2.1) enables code
In JetBrains PyCharm before 2022.1 exposure of the debugger port to the internal network was possible. Rated low severit
GitHub PoC
Exploit-DB