Stored XSS Vulnerability in JetBrains PyCharm Jupyter Notebook
CVE-2026-49384

6.1MEDIUM

Key Information:

Vendor

Jetbrains
Status
Pycharm
Vendor
CVE Published:
29 May 2026

What is CVE-2026-49384?

A vulnerability exists in JetBrains PyCharm prior to version 2025.3.4, allowing stored Cross-Site Scripting (XSS) attacks through Jupyter notebook Markdown cells. This flaw can enable an attacker to inject malicious scripts, which may execute whenever a user accesses a compromised notebook, potentially leading to unauthorized actions or data exposure.

Affected Version(s)

PyCharm 0 < 2025.3.4

References

https://www.jetbrains.com/privacy-security/issues-fixed/

CVSS V3.1

Score:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.