What is CVE-2026-33588?

CVE-2026-33588 is a high-severity vulnerability in Lfnovo Open-Notebook, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2026-05-07.

How severe is CVE-2026-33588?

High severity. CVSS v3 base score is 8.1 out of 10.

Improper input validation in Lfnovo Open-Notebook

CVE-2026-33588

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2026-05-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (7.7th percentile), scored 2026-10-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 8th percentile — 7.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.002 · change: -0.001

Affected products

Lfnovo Open-Notebook
Open Notebook — versions 0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

a6d3dc9e-0591-4a13-bce7-0f5b31ff6158 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-33588?: CVE-2026-33588 is a high-severity vulnerability in Lfnovo Open-Notebook, classified under Improper Input Validation. CVSS score: 8.1/10. Published 2026-05-07.
How severe is CVE-2026-33588?: High severity. CVSS v3 base score is 8.1 out of 10.