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CVE-2026-15748

CRITICAL 9.8 CVSS 3.1
Published
August 18, 2026
Last modified
October 22, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-434
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

The Forminator Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.56.1 via the handle_file_upload function. This is due to insufficient file type validation in handle_file_upload, where the dangerous-extension blocklist performs exact-key matching that is bypassed by pipe-alternative MIME type keys, combined with a public submission handler that trusts attacker-controlled upload field configuration injected via a forged Select field value. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

Affected WordPress components

  • Forminator Forms – Contact Form, Payment Form & Custom Form Builder Plugin · forminator
    Confirmed match Active
    Up to and including 1.56.1
    View on WordPress.org

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • wpmudev Forminator Forms – Contact Form, Payment Form & Custom Form Builder — Up to and including 1.56.1

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/admin/classes/class-admin-ajax.php#L1196
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/abstracts/abstract-class-field.php#L2308
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/fields/upload.php#L552
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/helpers/helper-fields.php#L3425
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/modules/custom-forms/front/front-action.php#L2767
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/modules/custom-forms/front/front-action.php#L738
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/263ac05d-f1ca-46e3-a43e-3b45eb8066d4?source=cve
  • nvd.nist.gov Official NVD record