# CVE-2026-123287: JetBrains Datalore authentication bypass in notebook export

Source: https://junglewise.ai/threats/cve-2026-123287-in-jetbrains-datalore-before-2026-4-private-notebook-files-could  
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-2026-123287 · Severity: medium · CVSS 5.9 · Published 2026-11-06

JetBrains Datalore is a collaborative data science notebook platform. Before version 2026.4, private notebook files could be downloaded by unauthenticated users through published interactive reports, allowing unauthorized access to sensitive analysis and data.

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

## Quick answers

**Is CVE-2026-123287 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-123287 being exploited in the wild.

**How severe is CVE-2026-123287?** Medium severity, with a CVSS score of 5.9, published 6 November 2026.

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

**Is there a fix for CVE-2026-123287?** 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-2026-123287 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-123287?** 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 authentication bypass in JetBrains Datalore allows unauthenticated users to download private notebook files via published interactive reports without proper access controls. The vulnerability affects Datalore versions before 2026.4 and can be exploited remotely without user interaction by accessing published report URLs. This grants attackers access to private notebook contents including code and associated data.

## 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 information disclosure in public report endpoint](https://junglewise.ai/threats/cve-2026-123290-in-jetbrains-datalore-before-2026-4-hidden-notebook-code-was)