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VulnerabilityPublished

CVE-2026-123290: JetBrains Datalore · Insertion of Sensitive Information Into Sent Data

Affects JetBrains DataloreSource CVE Database V5

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Not known to be exploited · CVSS 5.3 Medium : upgrade to 2026.4 when convenient.

Data as of 6 Nov 2026, 11:03 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (JetBrains)CVSS 3.15.3
Patch
Available – fixed in 2026.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

What to do

Upgrade JetBrains Datalore to 2026.4.

Affected software

ProductAffectedFixed in
JetBrainsDataloreAffected
  • <2026.4
Fixed in
  • 2026.4

AI-suggested

Upgrade JetBrains Datalore to version 2026.4 or later, where this vulnerability is fixed. No additional mitigation is required as the patch fully addresses the issue.

Description

JetBrains Datalore versions before 2026.4 contain a vulnerability where hidden notebook code was exposed to unauthenticated users through the public interactive report content endpoint. This exposure allows sensitive information insertion into sent data, classified under CWE-201. The issue is fixed in version 2026.4.

References

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