---
id: "CVE-2026-123290"
page: "https://infrastack.ai/live/CVE-2026-123290"
kind: "vulnerability"
aliases: ["CVE-2026-123290"]
title: "JetBrains Datalore: hidden notebook code exposed via public report endpoint"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["datalore", "jetbrains", "self-hosted", "vendor"]
not_affected_if: ["fixed-version", "no-public-reports"]
published_at: "2026-11-06T11:17:07+00:00"
first_seen_at: "2026-11-06T11:41:24+00:00"
updated_at: "2026-11-06T11:42:35+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-123290", "first_seen_at": "2026-11-06T11:41:24+00:00"}]
exploit_sources: []
---

# JetBrains Datalore: hidden notebook code exposed via public report endpoint

Link for people: https://infrastack.ai/live/CVE-2026-123290 (this .md is for agents)

In JetBrains Datalore before 2026.4, code that was hidden in a notebook was returned to unauthenticated users through the public interactive report content endpoint. An attacker can read notebook code that the author meant to keep out of view.

_Summary, check and fix written by a model from the sources; labelled as such._

## Fix

- Datalore: upgrade to 2026.4 or later (the sources state the fixed release as 2026.4)

## Timeline

- 2026-11-06T11:41:24+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-123290

## From the sources

In JetBrains Datalore before 2026.4 hidden notebook code was exposed to unauthenticated users via the public interactive report content endpoint

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_