CVE-2026-3459

HighUpdated

Published: 05 March 2026

Published

05 March 2026

Modified

22 April 2026

KEV Added

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Patch

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CVSS Score 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Score 0.0018 39.7th percentile

Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-3459 is a high-severity Unrestricted Upload of File with Dangerous Type (CWE-434) vulnerability in Wordpress (inferred from references). Its CVSS base score is 8.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 39.7th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190). What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-10 Information Input Validation good match

prevent

Mandates validation of all inputs including file uploads to enforce proper file type checks and block arbitrary dangerous files.

SI-2 Flaw Remediation good match

prevent

Requires timely identification, reporting, and correction of flaws like the plugin's insufficient file validation through patching to version 1.3.9.5 or later.

SI-3 Malicious Code Protection partial match

preventdetect

Deploys malicious code protection mechanisms to scan and prevent execution of arbitrary files uploaded via the vulnerable plugin.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

Why these techniques?

Unauthenticated arbitrary file upload vulnerability in public-facing WordPress plugin enables remote code execution, directly mapping to T1190: Exploit Public-Facing Application.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD Description

The Drag and Drop Multiple File Upload - Contact Form 7 plugin for WordPress is vulnerable to arbitrary file uploads due to insufficient file type validation in the 'dnd_upload_cf7_upload' function in versions up to, and including, 1.3.7.3. This makes it…

possible for unauthenticated attackers to upload arbitrary files on the affected site's server which may make remote code execution possible. This can be exploited if the form includes a multiple file upload field with ‘*’ as the accepted file type.

Deeper analysisAI

CVE-2026-3459 affects the Drag and Drop Multiple File Upload - Contact Form 7 plugin for WordPress, specifically versions up to and including 1.3.7.3. The vulnerability stems from insufficient file type validation in the 'dnd_upload_cf7_upload' function, enabling arbitrary file uploads. This issue is classified under CWE-434 (Unrestricted Upload of File with Dangerous Type) and carries a CVSS v3.1 base score of 8.1 (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H).

Unauthenticated attackers can exploit this vulnerability if the Contact Form 7 includes a multiple file upload field configured with '*' as the accepted file type. Successful exploitation allows attackers to upload arbitrary files to the affected site's server, potentially leading to remote code execution.

References indicate mitigation through updates to the plugin, with relevant code changes visible in version 1.3.9.5 at lines 1146 and 886 of dnd-upload-cf7.php, as well as changeset 3475121. The Wordfence threat intelligence advisory provides further details on the vulnerability.