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CVE-2026-123291VulnerabilityPublished

In JetBrains Datalore before 2026.4 improper owner validation allowed reading another workspace's issues and runs

Source GCVE Database

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Authoritative record:CVE-2026-123291· Medium 4.3

Not known to be exploited · CVSS 4.3 Medium : upgrade to 2026.4 when convenient.

Data as of 6 Nov 2026, 13:47 UTC

CVSS 3.1 base score
4.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (JetBrains)CVSS 3.14.3
Patch
Available – fixed in 2026.4
CVSS:3.1/AV:N/AC:L/PR:L/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 6 Nov 2026.

What to do

Upgrade Datalore to 2026.4.

Affected software

ProductAffectedFixed in
JetBrainsDataloreAffected
  • <2026.4
Fixed in
  • 2026.4

AI-suggested

If you cannot patch yet, restrict user privileges to minimize exposure and monitor access controls carefully.

Description

A vulnerability in JetBrains Datalore before version 2026.4 allows improper owner validation, which enables unauthorized users with limited privileges to read issues and runs from other workspaces. This flaw does not allow modification or denial of service but exposes some confidential information across workspace boundaries.

References

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