---
id: CVE-2026-82845
title: >-
  The Masteriyo LMS  WordPress plugin before 3.4.1 does not prevent
  user-supplied values held as metadata from being deserialized when they are
  read back, allowing users with a minimal account to inject arbitrary PHP
  objects and, by way of…
summary: >-
  The Masteriyo LMS  WordPress plugin before 3.4.1 does not prevent
  user-supplied values held as metadata from being deserialized when they are
  read back, allowing users with a minimal account to inject arbitrary PHP
  objects and, by way of…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-502
product: Masteriyo LMS
affected:
  - masteriyo_lms < 3.4.1
published: '2026-09-12'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T21:10:17.423'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82845'
references:
  - url: 'https://wpscan.com/vulnerability/5ced30ea-8b78-495f-b10c-42b3f10adcb3/'
    label: contact@wpscan.com
tags:
  - nvd
  - cve.org
epss: 0.00354
epssPercentile: 0.29263
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-12T15:22:11.992349Z'
ingestedAt: '2026-09-14T15:23:07.478Z'
---

## Overview

The Masteriyo LMS  WordPress plugin before 3.4.1 does not prevent user-supplied values held as metadata from being deserialized when they are read back, allowing users with a minimal account to inject arbitrary PHP objects and, by way of a class shipped in a library bundled with the Masteriyo LMS  WordPress plugin before 3.4.1, write and execute arbitrary code on the server. A weaker form of the same issue is reachable without an account and yields an arbitrary file write rather than code execution.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.