# CVE-2026-81200: MasterStudy LMS < 3.7.42 - Instructor+ Cross-Tenant Order Billing PII Disclosure via IDOR

> Instructors can access other users' billing PII by enumerating order IDs due to missing authorization checks in MasterStudy LMS.

- **Severity:** Low 2.7 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Aug 2026
- **Updated:** 30 Aug 2026
- **Also known as:** GHSA-wfqg-5qqg-7qjc

## What is CVE-2026-81200?

CVE-2026-81200 is a low-severity missing authorization vulnerability in Unknown MasterStudy LMS WordPress Plugin, published on 29 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

The MasterStudy LMS WordPress Plugin  WordPress plugin before 3.7.42 does not correctly restrict access to order information, allowing any user with the instructor role to read other users' order billing details, including name, email address, phone number and postal address, by enumerating order IDs.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-81200?


## How do I fix CVE-2026-81200?

No fix has been published for CVE-2026-81200 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-81200 being exploited?

There is no known exploitation of CVE-2026-81200 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-81200 and fix it if it is affected.

What it is: CVE-2026-81200 is a low-severity missing authorization vulnerability in Unknown MasterStudy LMS WordPress Plugin, published on 29 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-81200 in the wild and no public exploit code.

Affected product: Unknown MasterStudy LMS WordPress Plugin. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-81200/ (Markdown: https://insights.sbomify.com/CVE-2026-81200/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-81200
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-81200
- OSV: https://osv.dev/vulnerability/CVE-2026-81200

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-81200/
Summaries are generated and may contain mistakes; the official description above is the record.