Risk Letters

Exploited vulnerability

CVE-2026-84434

TLP:CLEAR

Unrestricted Upload of File with Dangerous Type

The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.1.0.4 via the upload_file function. This is due to a mismatch between the field validation pipeline and the file persistence pipeline, where hidden file upload fields bypass extension validation and a rejected file's intact upload state is later passed to upload_file() without re-v

Facts

  • Vendor: Gravity Forms
  • Product: Gravity Forms
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 3.9 %
  • First known exploitation: 18 September 2026
  • First seen by Risk Letters: 19 September 2026

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