# CVE-2026-123290: JetBrains Datalore information disclosure in public report endpoint

Source: https://junglewise.ai/threats/cve-2026-123290-in-jetbrains-datalore-before-2026-4-hidden-notebook-code-was  
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-2026-123290 · Severity: medium · CVSS 5.3 · Published 2026-11-06

JetBrains Datalore is a collaborative data analysis and notebook platform used by data scientists and analysts. An unauthenticated attacker could access hidden notebook code through the public interactive report feature, exposing sensitive analysis, formulas, and data processing logic that was intended to be private.

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

## Quick answers

**Is CVE-2026-123290 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-123290 being exploited in the wild.

**How severe is CVE-2026-123290?** Medium severity, with a CVSS score of 5.3, published 6 November 2026.

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

**Is there a fix for CVE-2026-123290?** 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-2026-123290 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-123290?** 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

An information disclosure vulnerability in the public interactive report content endpoint of Datalore allows unauthenticated users to retrieve hidden notebook code. The vulnerability exists in versions before 2026.4 and is accessible via network requests to the report endpoint without prior authentication, potentially exposing proprietary data processing logic.

## 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

- [JetBrains Datalore SSH private key exposure in Git backup](https://junglewise.ai/threats/cve-2026-123836-in-jetbrains-datalore-before-2026-4-workspace-collaborators)
- [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)
- [JetBrains Datalore improper scope validation in database tasks](https://junglewise.ai/threats/cve-2026-123834-in-jetbrains-datalore-before-2026-4-improper-scope-validation-in)
- [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 improper authorization in notebook access control](https://junglewise.ai/threats/cve-2026-123289-in-jetbrains-datalore-before-2026-4-improper-authorisation)