---
title: "CVE-2026-82845: Masteriyo LMS WordPress plugin - Insecure Deserialization"
description: "Masteriyo LMS WordPress plugin < 3.4.1 contains an insecure deserialization vulnerability caused by user-supplied metadata being deserialized, letting attackers with minimal accounts execute arbitrary code or write files, exploit requires user account."
url: https://panop.io/threat-heartbeat/CVE-2026-82845/
---

# CVE-2026-82845 Masteriyo LMS WordPress plugin - Insecure Deserialization

Masteriyo LMS WordPress plugin < 3.4.1 contains an insecure deserialization vulnerability caused by user-supplied metadata being deserialized, letting attackers with minimal accounts execute arbitrary code or write files, exploit requires user account.

CVSS base score 9.9 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.64% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-82845)

## Details

Type

Insecure Deserialization

Impact

Remote Code Execution, File System Write

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Published

12 September 2026

Updated

15 October 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Upgrade to version 3.4.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-82845](https://nvd.nist.gov/vuln/detail/CVE-2026-82845)
- [https://wpscan.com/vulnerability/5ced30ea-8b78-495f-b10c-42b3f10adcb3/](https://wpscan.com/vulnerability/5ced30ea-8b78-495f-b10c-42b3f10adcb3/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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