# CVE-2026-123279: JetBrains Datalore code execution in notebook computation

Source: https://junglewise.ai/threats/cve-2026-123279-in-jetbrains-datalore-before-2026-4-code-execution-was-possible  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-06. Updated: 2026-11-06  
License: CC BY 4.0 with a link back

CVE-2026-123279 · Severity: critical · CVSS 9 · Published 2026-11-06

JetBrains Datalore is a web-based data science notebook platform used for collaborative analytics and machine learning work. A critical vulnerability allows view-only collaborators on a shared notebook to execute arbitrary code on the server during notebook computation, bypassing the intended read-only access restrictions. This could enable unauthorized data theft, system compromise, or lateral movement within the organization.

Technologies: [Jetbrains Datalore](https://junglewise.ai/threats/technologies/datalore). Vendors: [Jetbrains](https://junglewise.ai/threats/vendors/jetbrains).

## Quick answers

**Is CVE-2026-123279 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-123279 being exploited in the wild.

**How severe is CVE-2026-123279?** Critical severity, with a CVSS score of 9, published 6 November 2026.

**Which products and versions are affected?** Jetbrains Datalore before 2026.4.

**Is there a fix for CVE-2026-123279?** Yes: fixed in Datalore 2026.4. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-123279 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-123279?** 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 Datalore 2026.4

## Technical details

Datalore's access control mechanism failed to properly enforce read-only restrictions during notebook computation execution. View-only collaborators could inject and execute arbitrary code by manipulating computation requests. The vulnerability affects the core notebook execution engine and allows authenticated remote attackers to gain server-side code execution without needing edit permissions.

## Affected products

- JetBrains Datalore before 2026.4

## Timeline

- 2026-11-06: disclosed

## References

- [https://www.jetbrains.com/privacy-security/issues-fixed/](https://www.jetbrains.com/privacy-security/issues-fixed/)

## Related threats

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- [JetBrains Datalore code execution via init script race condition](https://junglewise.ai/threats/cve-2026-123835-in-jetbrains-datalore-before-2026-4-code-execution-was-possible)
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- [JetBrains Datalore improper owner validation allowing workspace data access](https://junglewise.ai/threats/cve-2026-123291-in-jetbrains-datalore-before-2026-4-improper-owner-validation)
- [JetBrains Datalore information disclosure in public report endpoint](https://junglewise.ai/threats/cve-2026-123290-in-jetbrains-datalore-before-2026-4-hidden-notebook-code-was)