CVE-2026-3459
Published: 05 March 2026
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 41.9th 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).
Deeper analysis
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.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-9865
Vulnerability details
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…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
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.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Mandates validation of all inputs including file uploads to enforce proper file type checks and block arbitrary dangerous files.
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.
Deploys malicious code protection mechanisms to scan and prevent execution of arbitrary files uploaded via the vulnerable plugin.