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 extension blacklist that only blocks php, phpt, php5, php7, and exe extensions, while allowing dangerous extensions such as .phar or .phtml to be uploaded. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. Note: The exploit can only be exploited if a file field is added to the form.
History

Tue, 19 May 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 19 May 2026 13:45:00 +0000

Type Values Removed Values Added
First Time appeared Piotnet
Piotnet piotnet Forms
Wordpress
Wordpress wordpress
Vendors & Products Piotnet
Piotnet piotnet Forms
Wordpress
Wordpress wordpress

Tue, 19 May 2026 12:30:00 +0000

Type Values Removed Values Added
Description 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 extension blacklist that only blocks php, phpt, php5, php7, and exe extensions, while allowing dangerous extensions such as .phar or .phtml to be uploaded. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. Note: The exploit can only be exploited if a file field is added to the form.
Title Piotnet Forms <= 2.1.40 - Unauthenticated Arbitrary File Upload via Form File Upload
Weaknesses CWE-434
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: Wordfence

Published:

Updated: 2026-05-19T13:44:33.801Z

Reserved: 2026-03-26T08:46:53.428Z

Link: CVE-2026-4883

cve-icon Vulnrichment

Updated: 2026-05-19T13:44:30.335Z

cve-icon NVD

Status : Deferred

Published: 2026-05-19T13:16:19.340

Modified: 2026-05-19T14:38:39.660

Link: CVE-2026-4883

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-19T13:30:05Z