CVE-2026-66600

Media Library Assistant <= 3.39 - Authenticated (Author+) Arbitrary File Upload

2026-08-19 00:00
nh4tvd

Strategic Overview

Status
Patched in 3.40
Affected Plugin
Media Library Assistant
Affected Version
<= 3.39
CVSS
8.8High
Weakness type
CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE
CVE-2026-66600
View all Media Library Assistant vulnerabilities

At a glance

CVE-2026-66600 is a high-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Media Library Assistant WordPress plugin, affecting versions <= 3.39. It carries a CVSS score of 8.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires an authenticated account at Author level or above. The issue is fixed in version 3.40; sites on affected versions should update now. Disclosed August 2026, reported by nh4tvd.

Vulnerability Overview

The Media Library Assistant plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.39. This is due to missing file type validation. This makes it possible for authenticated attackers, with author-level access and above, to upload arbitrary files on the affected site's server, which may make remote code execution possible.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user. A successful exploit has high impact on confidentiality, integrity, availability — full site compromise territory.

CWE-434: Unrestricted Upload of File with Dangerous Type

Reaching this weakness in Media Library Assistant <= 3.39 takes an account at Author level or above. An unrestricted file upload lets a caller store a file whose type or destination the application does not properly constrain.

If an uploaded file lands anywhere the server will execute, the flaw becomes remote code execution and the site should be treated as fully compromised. For Media Library Assistant the fix is 3.40: builds <= 3.39 are affected, anything from 3.40 onward is not.

Remediation

Update to version 3.40, or a newer patched version

How does WordSec protect against this?

An attacker needs Author access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: Media Library Assistant 3.40 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-66600https://www.wordfence.com/threat-intel/vulnerabilities/id/0db18319-6552-42f1-b304-aca61780c12chttps://nvd.nist.gov/vuln/detail/CVE-2026-66600

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C