CVE-2026-5718Public exploitNetwork attack vector

Unauthenticated code execution via non-ASCII filename bypass

Published Apr 17, 2026 · Updated Apr 17, 2026

Arbitrary file upload in Drag and Drop Multiple File Upload for Contact Form 7 1.3.9.7 and earlier allows remote attackers to execute PHP code. When custom blacklist types are set, the plugin replaces its default dangerous-extension denylist, and wpcf7_antiscript_file_name() fails to sanitize non-ASCII filenames. An unauthenticated upload form must be reachable with a custom blacklist configured; a PHP payload can then execute with the web server's privileges.

CVSS severity8.1
High
EPSS probability4.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Arbitrary file upload in Drag and Drop Multiple File Upload for Contact Form 7 1.3.9.7 and earlier allows remote attackers to execute PHP code. When custom blacklist types are set, the plugin replaces its default dangerous-extension denylist, and wpcf7_antiscript_file_name() fails to sanitize non-ASCII filenames. An unauthenticated upload form must be reachable with a custom blacklist configured; a PHP payload can then execute with the web server's privileges.

The record

CVE
CVE-2026-5718
Published
Apr 17, 2026
Updated
Apr 17, 2026
Vendor
Glen Don Mongaya
Product
Drag and Drop Multiple File Upload for Contact Form 7
Classifications
CWE-434, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=1.3.9.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Glen Don Mongaya · Drag and Drop Multiple File Upload for Contact Form 7version=0 <=1.3.9.6

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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