# CVE-2023-40170: jupyter-server: jupyter-server is the backend for Jupyter web applications

CVE-2023-40170 is fixed in jupyter-server on 1 platform, first by DEBIAN-CVE-2023-40170, released August 28, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-40170
- Priority: Routine
- CVSS: 6.1 (medium)
- EPSS: 0.0062
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 28, 2023

## Description

jupyter-server is the backend for Jupyter web applications. Improper cross-site credential checks on `/files/` URLs could allow exposure of certain file contents, or accessing files when opening untrusted files via  "Open image in new tab". This issue has been addressed in commit `87a49272728` which has been included in release `2.7.2`. Users are advised to upgrade. Users unable to upgrade may use the lower performance `--ContentsManager.files_handler_class=jupyter_server.files.handlers.FilesHandler`, which implements the correct checks.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | jupyter-server Debian 13.5 (trixie) | 2.14.2-1 | [DEBIAN-CVE-2023-40170](https://patchblox.com/security/data/fix/linux/debian-cve-2023-40170.md) | Aug 28, 2023 |
| Linux | jupyter-server Debian 14 | 2.14.2-1 | [DEBIAN-CVE-2023-40170](https://patchblox.com/security/data/fix/linux/debian-cve-2023-40170.md) | Aug 28, 2023 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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