# CVE-2026-4817: SQL injection in MasterStudy LMS WordPress Plugin – for Online Courses and Education

> Authenticated attackers can extract sensitive database information via time-based blind SQL injection in the MasterStudy LMS plugin.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 17 Apr 2026
- **Updated:** 17 Apr 2026
- **Also known as:** GHSA-mw2x-833r-j7mf

## What is CVE-2026-4817?

CVE-2026-4817 is a medium-severity SQL injection vulnerability in stylemix MasterStudy LMS WordPress Plugin – for Online Courses and Education, published on 17 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The MasterStudy LMS WordPress Plugin for Online Courses and Education plugin for WordPress is vulnerable to Time-based Blind SQL Injection via the 'order' and 'orderby' parameters in the /lms/stm-lms/order/items REST API endpoint in versions up to and including 3.7.25. This is due to insufficient input sanitization combined with a design flaw in the custom Query builder class that allows unquoted SQL injection in ORDER BY clauses. When the Query builder detects parentheses in the sort_by parameter, it treats the value as a SQL function and directly concatenates it into the ORDER BY clause without any quoting. While esc_sql() is applied to escape quotes and backslashes, this cannot prevent ORDER BY injection when the values themselves are not wrapped in quotes in the resulting SQL statement. This makes it possible for authenticated attackers, with subscriber-level access and above, to append arbitrary SQL queries via the ORDER BY clause to extract sensitive information from the database including user credentials, session tokens, and other confidential data through time-based blind SQL injection techniques.

Weakness: CWE-89 (Improper Neutralization of Special Elements used in an SQL Command)

## Which versions are affected by CVE-2026-4817?


## How do I fix CVE-2026-4817?

No fix has been published for CVE-2026-4817 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-4817 being exploited?

There is no known exploitation of CVE-2026-4817 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-4817 and fix it if it is affected.

What it is: CVE-2026-4817 is a medium-severity SQL injection vulnerability in stylemix MasterStudy LMS WordPress Plugin – for Online Courses and Education, published on 17 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-4817 in the wild and no public exploit code.

Affected product: stylemix MasterStudy LMS WordPress Plugin – for Online Courses and Education. 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-2026-4817/ (Markdown: https://insights.sbomify.com/CVE-2026-4817/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-4817
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-4817
- OSV: https://osv.dev/vulnerability/CVE-2026-4817

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-4817/
Summaries are generated and may contain mistakes; the official description above is the record.