CVE-2026-75060Hinoki check available

Code execution via unauthenticated Jupyter MCP

Published Aug 17, 2026 · Updated Aug 18, 2026

Missing authentication in Jupyter MCP tools in JetBrains PyCharm before 2026.2.1 allows attackers to execute code via MCP requests. PyCharm's integrated MCP server exposes Jupyter notebook tools to external clients, and the vulnerable build did not enforce an authentication check before forwarding notebook actions that can run code in the active Jupyter kernel. Reachability depends on the IDE user enabling the bundled MCP Server and exposing those tools to a client; successful use yields code execution in the context of the PyCharm process and attached Jupyter environment.

CVSS severity8.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Missing authentication in Jupyter MCP tools in JetBrains PyCharm before 2026.2.1 allows attackers to execute code via MCP requests. PyCharm's integrated MCP server exposes Jupyter notebook tools to external clients, and the vulnerable build did not enforce an authentication check before forwarding notebook actions that can run code in the active Jupyter kernel. Reachability depends on the IDE user enabling the bundled MCP Server and exposing those tools to a client; successful use yields code execution in the context of the PyCharm process and attached Jupyter environment.

The record

CVE
CVE-2026-75060
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
JetBrains
Product
PyCharm
Classifications
CWE-306, T1059.006
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 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 <2026.2.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

JetBrains · PyCharmversion=0 <2026.2.1

Published CVSS scores

8.4JetBrains s.r.o.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

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

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1059.006Command and Scripting Interpreter: Python

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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