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Vulnerabilities

Vulnerability · CVE-2026-84434

Unrestricted Upload of File with Dangerous Type

Published Sep 18, 2026 · catalog updated Sep 18, 2026 · Gravity Forms Gravity Forms

Patch now

CVE-2026-84434 is in the CISA known-exploited catalog. Confirm Gravity Forms Gravity Forms against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Unknown—
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
3.91%
Remediation
Remediation guidance
Affected products
stated Gravity Forms · vendor Gravity Forms Gravity Forms

The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.1.0.4 via the upload_file function. This is due to a mismatch between the field validation pipeline and the file persistence pipeline, where hidden file upload fields bypass extension validation and a rejected file's intact upload state is later passed to upload_file() without re-validation. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. Exploitation requires the targeted form to contain a Initial-access exploit intelligence.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated Gravity Forms<= 3.1.0
  • vendor Gravity Forms Gravity Formsversion unspecified

How to fix CVE-2026-84434

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-84434 is in the CISA known-exploited catalog. Confirm Gravity Forms Gravity Forms against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with Gravity Forms <= 3.1.0. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

No weakness class is stored. EPSS 3.91%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 18, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  2. Oct 17, 2026 · Nuclei Templates

    Detected

    CVE-2026-84434 has a public Nuclei detection template.

Sources

  • CVE.orgVulnerability recordCVE-2026-84434

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-84434

    30-day exploitation probability 3.9%

    first.org
  • Nuclei TemplatesDetection templateCVE-2026-84434

    CVE-2026-84434 has a public Nuclei detection template.

    github.com
  • VulnCheck KEVConfirmed exploitationCVE-2026-84434

    The Gravity Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.1.0.4 via the upload_file function. This is due to a mismatch between the field validation pipeline and the file persistence pipeline, where hidden file upload fi

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.