Arbitrary file upload in Piotnet Forms
CVE-2026-4883
The Piotnet Forms plugin for WordPress is vulnerable to arbitrary file upload due to missing file type validation in the 'piotnetforms_ajax_form_builder' function in all versions up to, and including, 2.1.40. The plugin uses an incomplete…
Vulnerability class: Unrestricted File Upload
EPSS: 0.002 (41.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Piotnet Forms — versions 0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-4883?
- CVE-2026-4883 is a critical-severity vulnerability in Piotnet Forms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-05-19.
- How severe is CVE-2026-4883?
- Critical severity. CVSS v3 base score is 9.8 out of 10.