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Vulnerability details

CVE-2026-5718

glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7

Drag and Drop Multiple File Upload for Contact Form 7 <= 1.3.9.7 - Unauthenticated Arbitrary File Upload via Non-ASCII Filename Blacklist Bypass

CVSS 3.1
8.1High

Official 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).

CVSS scores

ScoreVersionSourceVector
8.1High 3.1 CVEProject cvelistV5 (CNA) (Wordfence) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

VendorProductVersionsSource
glenwpcoder Drag and Drop Multiple File Upload for Contact Form 7 v ≤ 1.3.9.7 CVEProject cvelistV5 (CNA)

References and advisories

7
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Details

Published
2026-04-17
Last updated
2026-05-27
State
Published
Assigner (CNA)
Wordfence

Exploit prediction (EPSS)

4.17%
Probability of exploitation in 30 days
90.9%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Total

Weaknesses (CWE)

  • CWE-434
    Unrestricted Upload of File with Dangerous Type