Is CVE-2026-123283 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-123283 being exploited in the wild.

How severe is CVE-2026-123283?

Medium severity, with a CVSS score of 6.8, published 6 November 2026.

Which products and versions are affected?

Jetbrains Datalore before 2026.4.

Is there a fix for CVE-2026-123283?

Yes: fixed in 2026.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-123283 attacked?

It is attacked over the network.

Am I affected by CVE-2026-123283?

Check whether you run Jetbrains Datalore at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-123283: JetBrains Datalore account takeover in SSO sign-in

CVE-2026-123283 · Severity: medium · CVSS 6.8 · Published 2026-11-06

JetBrains Datalore is a cloud-based data science platform that allows users to collaborate on analytics and notebooks. An attacker could take over user accounts by exploiting a flaw in single sign-on (SSO) authentication that allowed them to access pre-registered accounts without proper verification. This could lead to unauthorized access to sensitive data analysis projects and notebooks.

Technologies: Jetbrains Datalore. Vendors: Jetbrains.

Quick answers

Is CVE-2026-123283 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-123283 being exploited in the wild.
How severe is CVE-2026-123283?: Medium severity, with a CVSS score of 6.8, published 6 November 2026.
Which products and versions are affected?: Jetbrains Datalore before 2026.4.
Is there a fix for CVE-2026-123283?: Yes: fixed in 2026.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-123283 attacked?: It is attacked over the network.
Am I affected by CVE-2026-123283?: Check whether you run Jetbrains Datalore at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 2026.4

Technical details

The vulnerability exists in the SSO sign-in flow of JetBrains Datalore and allows account takeover by exploiting improper authentication validation for pre-registered accounts. An attacker with network access can exploit this flaw without requiring authentication or user interaction to hijack an existing account. The vulnerability is fixed in version 2026.4 and later.

Affected products

JetBrains Datalore before 2026.4

Timeline

2026-11-06: disclosed

References

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

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