Is there a public exploit for CVE-2026-123854?

No public exploit for CVE-2026-123854 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-123854?

CVE-2026-123854 scores CVSS 5.5 (v3.1), rated medium.

What does CVE-2026-123854 affect?

CVE-2026-123854 affects JetBrains PyCharm. It is part of the AI and agent stack (Jupyter).

5.5 Medium

In JetBrains PyCharm before 2026.3 code execution was possible in Safe Mode via a crafted Jupyter notebook widget module

CVE-2026-123854

Part of the AI stack

This affects Jupyter, in Apps & interfaces.

Assessment

CVSS: 5.5 (v3.1)
Severity: Medium
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 6 November 2026
Last updated: 7 November 2026
Affected: JetBrains · PyCharm
Assigner: JetBrains

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

At the source

EUVD (ENISA)

References

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

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