Forminator Forms <= 1.56.1 - Unauthenticated Arbitrary File Upload via Forged Upload Field Configuration

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-15748
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-18 06:16:40 UTC
Updated2026-08-18 06:16:40 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Problem Types: CWE-434 | CWE-434 CWE-434 Unrestricted Upload of File with Dangerous Type

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Wpmudev Forminator Forms Contact Form Payment Form Custom Form Builder affected 1.56.1 semver Not specified

References

ReferenceSourceLinkTags
www.wordfence.com/threat-intel/vulnerabilities/id/263ac05d-f1ca-46e3-a43e-3b45e... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/helpers/helper-fields.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/fields/upload.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/admin/classes/class-admin-ajax... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/abstracts/abstract-cla... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/modules/custom-forms/f... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/forminator/tags/1.55.1/library/modules/custom-forms/f... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: daroo (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-14T15:25:05.000ZVendor Notified
CNA2026-08-17T16:39:51.000ZDisclosed

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