CVE-2026-5718
HighExploitedDrag and Drop Multiple File Upload for Contact Form 7 <= 1.3.9.6 - Unauthenticated Arbitrary File Upload via Non-ASCII Filename Blacklist Bypass
Published Apr 17, 2026 · Updated May 27, 2026 · Also known as 38f95d40-a6d4-429c-9872-9d2531e942eb, EUVD-2026-23459, GHSA-xj7v-jqv6-v48w
Key Facts
Patch immediately- CVE-2026-5718 is a high-severity vulnerability (CVSS 8.1 v3.1) affecting drag-and-drop-multiple-file-upload-contact-form-7 (wordpress-plugin), Drag and Drop Multiple File Upload for Contact Form 7.
- It is exploited in the wild, listed in Industry KEV feed since Apr 20, 2026. No public exploit code is known.
- EPSS estimates a 3.5% probability of exploitation in the next 30 days.
- Fixed versions are available, including drag-and-drop-multiple-file-upload-contact-form-7 1.3.9.8.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
3.5%
Exploited in the wild
Yes
1 catalog listing
Public exploit code
None known
Get the full CVE-2026-5718 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
Description
The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.7. This is due to insufficient file type validation that occurs when custom blacklist types are configured, which replaces the default dangerous extension denylist instead of merging with it, and the wpcf7_antiscript_file_name() sanitization function being bypassed for filenames containing non-ASCII characters. This makes it possible for unauthenticated attackers to upload arbitrary files, such as PHP files, to the server, which can be leveraged to achieve remote code execution. The vulnerability was originally reported by Leonid Semenenko (lsemenenko) and partially patched in version 1.3.9.7. A bypass for the patch was separately discovered and reported by Nguyen Hung (Mitchell).
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Apr 20, 2026 | n/a | Not reported |
Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| drag-and-drop-multiple-file-upload-contact-form-7wordpress-plugin | See advisory | 1.3.9.8 |
| Drag and Drop Multiple File Upload for Contact Form 7 | See advisory | n/a |
Patched Releases
drag-and-drop-multiple-file-upload-contact-form-7
1.3.9.8
Timeline
Publicly disclosed
Apr 17, 2026
Added to Industry KEV feed
Apr 20, 2026
Last updated
May 27, 2026
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisoryhttps://plugins.trac.wordpress.org/changeset/3548901/
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/38f95d40-a6d4-429c-9872-9d2531e942eb?source=api-prod
- advisoryhttps://www.wordfence.com/threat-intel/vulnerabilities/id/38f95d40-a6d4-429c-9872-9d2531e942eb?source=api-scan
- exploitVulnCheck exploitation report
- otherhttps://plugins.trac.wordpress.org/browser/drag-and-drop-multiple-file-upload-contact-form-7/tags/1.3.9.6/inc/dnd-upload-cf7.php#L62
FAQ
Common Questions.
The Drag and Drop Multiple File Upload for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file upload in versions up to, and including, 1.3.9.7.
Affected: drag-and-drop-multiple-file-upload-contact-form-7 (wordpress-plugin); Drag and Drop Multiple File Upload for Contact Form 7. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Apr 20, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including drag-and-drop-multiple-file-upload-contact-form-7 1.3.9.8.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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