CVE-2026-84434Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via hidden upload field

Published Sep 19, 2026 · Updated Sep 19, 2026

Arbitrary file upload in Rocketgenius Gravity Forms 3.1.0.4 and earlier allows remote attackers to execute code through a public form. Hidden File Upload fields bypass extension validation, and upload_file() later persists the rejected file without repeating that validation. Exploitation requires a publicly accessible form with a File Upload field set to Hidden; code execution also depends on the server executing the uploaded file.

CVSS severity9.8
Critical
EPSS probability3.91%
Next 30 days · Oct 19, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Rocketgenius Gravity Forms 3.1.0.4 and earlier allows remote attackers to execute code through a public form. Hidden File Upload fields bypass extension validation, and upload_file() later persists the rejected file without repeating that validation. Exploitation requires a publicly accessible form with a File Upload field set to Hidden; code execution also depends on the server executing the uploaded file.

The record

CVE
CVE-2026-84434
Published
Sep 19, 2026
Updated
Sep 19, 2026
Vendor
Rocketgenius
Product
Gravity Forms
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=3.1.0.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rocketgenius · Gravity Formsversion=0 <=3.1.0.4

Published CVSS scores

9.8GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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