CVE-2023-6220: Piotnet Forms <= 1.0.28 - Unauthenticated Arbitrary File Upload

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-01-11 · updated 2026-06-17
Weakness: CWE-434

Description

The Piotnet Forms plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient file type validation in the 'piotnetforms_ajax_form_builder' function in versions up to, and including, 1.0.28. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.

Affected products

piotnetdotcom Piotnet Forms: through 1.0.26

References

https://plugins.trac.wordpress.org/browser/piotnetforms/tags/1.0.26/inc/forms/ajax-form-builder.php#L430
https://plugins.trac.wordpress.org/browser/piotnetforms/tags/1.0.29/inc/forms/ajax-form-builder.php#L430
https://www.wordfence.com/threat-intel/vulnerabilities/id/af2b7eac-a3f5-408f-b139-643e70b3f27a?source=cve
https://plugins.trac.wordpress.org/browser/piotnetforms/tags/1.0.26/inc/forms/ajax-form-builder.php#L430
https://www.wordfence.com/threat-intel/vulnerabilities/id/af2b7eac-a3f5-408f-b139-643e70b3f27a?source=cve

Get alerted when CVE-2023-6220 or the next vulnerability affects your stack