# CVE-2026-123287: In JetBrains Datalore before 2026.4 private notebook files could be downloaded without authentication via published interactive reports


- **Severity:** Medium 5.9 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 6 Nov 2026
- **Updated:** 10 Nov 2026
- **Also known as:** GHSA-9xgf-fr3w-jgmq

## What is CVE-2026-123287?

CVE-2026-123287 is a medium-severity vulnerability in JetBrains Datalore, published on 6 Nov 2026. 

### Official description

In JetBrains Datalore before 2026.4 private notebook files could be downloaded without authentication via published interactive reports

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-123287?

It affects 1 product.


Products: JetBrains Datalore.

## How do I fix CVE-2026-123287?

No fix has been published for CVE-2026-123287 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-123287 being exploited?

There is no known exploitation of CVE-2026-123287 in the wild and no public exploit code.

## Other vulnerabilities in JetBrains Datalore

- [CVE-2026-123836](https://insights.sbomify.com/CVE-2026-123836/): In JetBrains Datalore before 2026.4 workspace collaborators could obtain the owner's SSH private key via Git backup (high 8.8)
- [CVE-2026-123834](https://insights.sbomify.com/CVE-2026-123834/): In JetBrains Datalore before 2026.4 improper scope validation in database tasks allowed using another workspace's service account (high 7.5)
- [CVE-2026-123285](https://insights.sbomify.com/CVE-2026-123285/): In JetBrains Datalore before 2026.3 command execution was possible in the database task container via JVM options injection (medium 6.3)
- [CVE-2026-32745](https://insights.sbomify.com/CVE-2026-32745/): In JetBrains Datalore before 2026.1 session hijacking was possible due to missing secure attribute for cookie settings (medium 6.3)
- [CVE-2026-123286](https://insights.sbomify.com/CVE-2026-123286/): In JetBrains Datalore before 2026.4 improper authorisation allowed read the notebook owner's file storage session token (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-123287 and fix it if it is affected.

What it is: CVE-2026-123287 is a medium-severity vulnerability in JetBrains Datalore, published on 6 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-123287 in the wild and no public exploit code.

Affected product: JetBrains Datalore. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-123287/ (Markdown: https://insights.sbomify.com/CVE-2026-123287/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-123287
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-123287
- OSV: https://osv.dev/vulnerability/CVE-2026-123287

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-123287/
Summaries are generated and may contain mistakes; the official description above is the record.