Risk Letters

Exploited vulnerability

CVE-2026-84999

TLP:CLEAR

Unrestricted Upload of File with Dangerous Type

The Pie Register Premium plugin for WordPress is vulnerable to Unrestricted File Type Upload in all versions up to, and including, 3.8.4.0 via the piereg_file_upload function. This is due to the plugin performing file type validation via wp_check_filetype and wp_check_filetype_and_ext but never checking whether those validation calls produced errors before move_uploaded_file() is called, combined

Facts

  • Vendor: Pie Register
  • Product: Pie Register Premium
  • CVSS: 9.8
  • EPSS (probability of exploitation within 30 days): 0.5 %
  • First known exploitation: 27 October 2026
  • First seen by Risk Letters: 28 October 2026

Members see which Nordic sectors the flaw hits, and what to do about it.

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