# CVE-2026-33587: Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Source: https://junglewise.ai/threats/cve-2026-33587-lack-of-user-input-sanitisation-in-open-notebook-v1-8-3-allows  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-07  
License: CC BY 4.0 with a link back

CVE-2026-33587 · Severity: critical · CVSS 10 · Published 2026-05-07

Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and subsequently OS commands) on the docker container via Server-Side Template Injection (SSTI) for user-created transformations.

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

## Quick answers

**Is CVE-2026-33587 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-33587 being exploited in the wild.

**How severe is CVE-2026-33587?** Critical severity, with a CVSS score of 10, 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-2026-33587?** 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-2026-33587?** 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 validation in the file upload functionality of Open Notebook v1.8.3 allows the application user to…](https://junglewise.ai/threats/cve-2026-33588-lack-of-user-input-validation-in-the-file-upload-functionality-of)
- [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)