CVE-2026-25847Network attack vector

Script execution via Jupyter viewer DOM XSS

Published Feb 9, 2026 · Updated Feb 9, 2026

DOM-based XSS in the Jupyter viewer in JetBrains PyCharm before 2025.3.2 allows remote attackers to execute script in a user's IDE. JetBrains identifies the Jupyter viewer page as the affected locus but has not published which DOM source, sink, or sanitization operation mishandles attacker-controlled content. Exploitation requires a user to view crafted Jupyter content; successful script execution exposes or modifies data and can interrupt the IDE.

CVSS severity8.2
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DOM-based XSS in the Jupyter viewer in JetBrains PyCharm before 2025.3.2 allows remote attackers to execute script in a user's IDE. JetBrains identifies the Jupyter viewer page as the affected locus but has not published which DOM source, sink, or sanitization operation mishandles attacker-controlled content. Exploitation requires a user to view crafted Jupyter content; successful script execution exposes or modifies data and can interrupt the IDE.

The record

CVE
CVE-2026-25847
Published
Feb 9, 2026
Updated
Feb 9, 2026
Vendor
JetBrains
Product
PyCharm
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2025.3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

JetBrains · PyCharmversion=0 <2025.3.2

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
8.2JetBrains s.r.o.CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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