# CVE-2026-33588: Lack of user input validation in the file upload functionality of Open Notebook v1.8.3 allows the application user to…

Source: https://junglewise.ai/threats/cve-2026-33588-lack-of-user-input-validation-in-the-file-upload-functionality-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-07  
License: CC BY 4.0 with a link back

CVE-2026-33588 · Severity: high · CVSS 8.1 · Published 2026-05-07

Lack of user input validation in the file upload functionality of Open Notebook v1.8.3 allows the application user to create or modify files on the docker container via path traversal.

Technologies: [Lfnovo Open Notebook](https://junglewise.ai/threats/technologies/open-notebook). Vendors: [Lfnovo](https://junglewise.ai/threats/vendors/lfnovo).

## Quick answers

**Is CVE-2026-33588 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33588 being exploited in the wild.

**How severe is CVE-2026-33588?** High severity, with a CVSS score of 8.1, published 7 May 2026.

**Which products and versions are affected?** Lfnovo Open Notebook. The advisory does not name versions.

**Is there a fix for CVE-2026-33588?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2026-33588?** Check whether you run Lfnovo Open Notebook. 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.

## Affected products

- Lfnovo Open Notebook

## Related threats

- [Open Notebook server-side request forgery in /api/sources](https://junglewise.ai/threats/cve-2026-90769-open-notebook-server-side-request-forgery-in-api-sources)
- [Lack of user input validation in the file upload functionality of Open Notebook v1.8.3 allows the application user to…](https://junglewise.ai/threats/cve-2026-33589-lack-of-user-input-validation-in-the-file-upload-functionality-of)
- [Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…](https://junglewise.ai/threats/cve-2026-33587-lack-of-user-input-sanitisation-in-open-notebook-v1-8-3-allows)
- [An improper input validation, together with an overly permissive default CORS configuration in Open Notebook v1.8.1…](https://junglewise.ai/threats/cve-2026-28201-an-improper-input-validation-together-with-an-overly-permissive)