CVE-2026-18781

Deferred Deferred - Pending Action

Arbitrary File Upload in Drag and Drop Multiple File Upload for Contact Form 7 WordPress Plugin

Publication date: 2026-08-21

Last updated on: 2026-08-26

Assigner: WPScan

Description

The Drag and Drop Multiple File Upload for Contact Form 7 WordPress plugin before 1.3.9.9 does not validate the final name of an uploaded file after stripping characters from it, allowing unauthenticated users to defeat its file type restrictions and execute arbitrary code on the server.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-21

Last Modified

2026-08-26

Generated

2026-09-10

AI Q&A

2026-08-21

EPSS Evaluated

2026-09-09

NVD

CVE-2026-18781

EUVD

EUVD-2026-63821

Affected Vendors & Products

Vendor	Product	Version / Range
wpninjas	drag_and_drop_multiple_file_upload_for_contact_form_7	to 1.3.9.9 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-94	The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

Attack-Flow Graph

Executive Summary

This vulnerability affects the WordPress plugin 'Drag and Drop Multiple File Upload for Contact Form 7' before version 1.3.9.9. It allows unauthenticated users to bypass file type restrictions by exploiting control characters in filenames after character stripping, leading to remote code execution on the server.

Detection Guidance

Check the installed version of the Drag and Drop Multiple File Upload for Contact Form 7 plugin. If it is below 1.3.9.9, the system is vulnerable. Use commands like 'wp plugin list' in WordPress CLI or inspect the plugin files directly.

Impact Analysis

Attackers could upload malicious files disguised with control characters in filenames, bypassing security checks. If the web server supports per-directory configuration overrides and the site uses a non-default field setup, this could allow arbitrary code execution on your server, potentially compromising your website and data.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating compliance requirements under GDPR and HIPAA. A successful exploit may expose sensitive user data, resulting in legal penalties, reputational damage, and loss of trust.

Mitigation Strategies

Update the Drag and Drop Multiple File Upload for Contact Form 7 plugin to version 1.3.9.9 or later immediately. If updating is not possible, consider disabling the plugin until an update is applied.

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