CVE-2026-73996

Masteriyo LMS – LMS Course Builder, Quizzes & Certificates <= 2.3.2 - Unauthenticated Arbitrary File Upload

2026-08-18 00:00
20kilograma

Strategic Overview

Status
Patched in 2.3.3
Affected Plugin
Masteriyo LMS – LMS Course Builder, Quizzes & Certificates
Affected Version
<= 2.3.2
CVSS
9.8Critical
Weakness type
CWE-434 · Unrestricted Upload of File with Dangerous Type
CVE
CVE-2026-73996
View all Masteriyo LMS – LMS Course Builder, Quizzes & Certificates vulnerabilities

At a glance

CVE-2026-73996 is a critical-severity Unrestricted Upload of File with Dangerous Type vulnerability in the Masteriyo LMS WordPress plugin, affecting versions <= 2.3.2. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 2.3.3; sites on affected versions should update now. Disclosed August 2026, reported by 20kilograma.

Vulnerability Overview

The Masteriyo LMS – LMS Course Builder, Quizzes & Certificates plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 2.3.2. This is due to missing file type validation. This makes it possible for unauthenticated attackers 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 privileges on the target site, 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 Masteriyo LMS <= 2.3.2 takes no account at all. 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 Masteriyo LMS the fix is 2.3.3: builds <= 2.3.2 are affected, anything from 2.3.3 onward is not.

Remediation

Update to version 2.3.3, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: 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: Masteriyo LMS 2.3.3 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Scanner
  • Login Security

External References

https://www.cve.org/CVERecord?id=CVE-2026-73996https://www.wordfence.com/threat-intel/vulnerabilities/id/87d6322c-3031-47c7-a1ad-2ce805e58755https://nvd.nist.gov/vuln/detail/CVE-2026-73996

Related records

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