Multi Uploader for Gravity Forms <= 1.1.9 - Unauthenticated Arbitrary File Upload via Chunked File Upload

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-87796
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 05:17:02 UTC
Updated2026-09-17 05:17:02 UTC
DescriptionThe Multi Uploader for Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.1.9 via the move_file function. This is due to insufficient file type validation during chunked upload handling. This makes it possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make 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 Sh1zen Multi Uploader For Gravity Forms affected 1.1.9 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/47337bc1-fa3d-470c-9524-85929... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/GFMUAddon.class.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMUHandlePluploader... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/gf-multi-uploader/tags/1.1.9/inc/GFMU_FileUploader.php [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: Adam Rayyan Aryasatya (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-08-01T00:00:00.000ZDiscovered
CNA2026-09-16T16:20:28.000ZDisclosed

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