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