CVE-2026-18351: File Upload RCE (CVSS 9.8)

Description

The Drag and Drop File Upload for Elementor Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.6.0 via the elementor_file_upload function. This is due to insufficient file type validation in the is_file_type_valid() function, which uses the attacker-controlled 'type' parameter as regex keys in the MIME allowlist, allowing blacklist bypass via a crafted extension that sanitize_file_name() later normalizes to a PHP extension. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

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CVSS v3.1 Score

9.8

CRITICAL

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

EPSS — Exploit Prediction

0.0077

Probability of exploitation

0.54%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-434 Unrestricted Upload

References

Other References

https://plugins.svn.wordpress.org/drag-and-drop-file-upload-for-elementor-forms/tags/1.6.0/drag-and-drop-file-upload-for-elementor-forms.php https://plugins.svn.wordpress.org/drag-and-drop-file-upload-for-elementor-forms/tags/1.6.0/fields/file_upload.php https://plugins.trac.wordpress.org/browser/drag-and-drop-file-upload-for-elementor-forms/tags/1.6.0/fields/file_upload.php#L833 https://plugins.trac.wordpress.org/changeset/3628051/drag-and-drop-file-upload-for-elementor-forms https://www.wordfence.com/threat-intel/vulnerabilities/id/03e853be-510f-4957-a227-17ca9f825b12?source=cve

Frequently Asked Questions

What is CVE-2026-18351? +

The Drag and Drop File Upload for Elementor Forms plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 1.6.0 via the elementor_file_upload function. This is due to insufficient file type validation in the is_file_type_valid() function, which uses the attacker-controlled 'type' parameter as regex keys in the MIME allowlist, allowing blacklist bypass via a crafted extension that sanitize_file_name() later normalizes to a PHP extension. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-18351? +

CVE-2026-18351 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0077, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-18351? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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