---
id: "CVE-2026-118090"
kind: "vulnerability"
aliases: ["CVE-2026-118090"]
title: "MasterStudy LMS: subscribers can inject PHP objects through a flaw"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["masterstudy-lms", "package", "php", "wordpress"]
not_affected_if: ["newer-version", "plugin-not-installed"]
published_at: "2026-10-30T19:18:17+00:00"
first_seen_at: "2026-10-30T19:25:28+00:00"
updated_at: "2026-10-30T19:25:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118090", "first_seen_at": "2026-10-30T19:25:28+00:00"}]
---

# MasterStudy LMS: subscribers can inject PHP objects through a flaw

MasterStudy LMS versions up to and including 3.7.55 let a logged-in subscriber user submit data that is unsafely deserialized as a PHP object. An attacker with a subscriber account may be able to run code or change data on the site, with the exact impact depending on available gadget chains, which the sources do not describe.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed MasterStudy LMS plugin version in the WordPress admin plugins page or the plugin header of `masterstudy-lms-learning-management-system`; `3.7.55` or older is affected.
- Confirm whether subscriber-level accounts can register on the site.

## Fix

- MasterStudy LMS: move to a version newer than `3.7.55`; the exact fixed version is unknown from the sources.

## Timeline

- 2026-10-30T19:25:28+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118090

## From the sources

Subscriber PHP Object Injection in MasterStudy LMS <= 3.7.55 versions.

---

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