Quick answers
- Is CVE-2026-123288 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-123288 being exploited in the wild.
- How severe is CVE-2026-123288?
- Medium severity, with a CVSS score of 5.4, published 6 November 2026.
- Which products and versions are affected?
- Jetbrains Datalore before 2026.4.
- Is there a fix for CVE-2026-123288?
- 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-2026-123288 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-123288?
- 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
A stored cross-site scripting (XSS) vulnerability exists in the notebook charts functionality of Datalore, exploitable via the Vega editor link parameter. The vulnerability requires an authenticated user to craft a malicious notebook with an XSS payload embedded in the chart editor link; the payload persists and executes in the browsers of other users viewing the notebook. This allows an authenticated attacker to execute arbitrary JavaScript in the context of other users' Datalore sessions.
Affected products
- JetBrains Datalore before 2026.4
Timeline
- 2026-11-06: disclosed