Risk Letters

Exploited vulnerability

CVE-2026-4883

TLP:CLEAR

piotnet piotnet_forms Unrestricted Upload of File with Dangerous Type

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

Facts

  • Vendor: piotnet
  • Product: piotnet_forms
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 3.1 %
  • First known exploitation: 13 October 2026
  • First seen by Risk Letters: 19 May 2026

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Data: NVD (public domain), CISA KEV, FIRST EPSS, MITRE ATT&CK, AlienVault OTX. NVD