# CVE-2026-88846: MasterStudy LMS WordPress Plugin account creation bypass with registration disabled

Source: https://junglewise.ai/threats/cve-2026-88846-the-masterstudy-lms-wordpress-plugin-wordpress-plugin-before-3-7  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-24. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-88846 · Severity: medium · CVSS 5.3 · Published 2026-09-24

MasterStudy LMS is a learning management system plugin for WordPress that handles user registration. The plugin fails to verify whether site administrators have disabled user registration before allowing account creation through its front-end forms. An unauthenticated attacker can create and log into accounts on sites where registration was intentionally disabled, potentially gaining unauthorized access to course content or platform features.

Technologies: [MasterStudy LMS](https://junglewise.ai/threats/technologies/masterstudy-masterstudy-lms). Vendors: [MasterStudy](https://junglewise.ai/threats/vendors/masterstudy).

## Quick answers

**Is CVE-2026-88846 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88846 being exploited in the wild.

**How severe is CVE-2026-88846?** Medium severity, with a CVSS score of 5.3, published 24 September 2026.

**Which products and versions are affected?** MasterStudy LMS 2.3.0 through 3.7.49.

**Is there a fix for CVE-2026-88846?** A patch was published on 2026-09-24: Fixed in version 3.7.50 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-88846 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-88846?** Check whether you run MasterStudy LMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The plugin lacks authorization checks in its front-end registration flow to respect the site's user registration setting (CWE-862: Missing Authorization). An unauthenticated attacker with network access can bypass the registration restriction by submitting account creation requests directly through the plugin's forms, resulting in account creation and automatic login. A fix is available in version 3.7.50 and later.

## Affected products

- MasterStudy MasterStudy LMS 2.3.0 through 3.7.49

## Timeline

- 2026-09-22: disclosed
- 2026-09-24: patched: Fixed in version 3.7.50

## References

- [https://wpscan.com/vulnerability/57b0dd3f-bd83-4fb7-b98d-c999026910cd/](https://wpscan.com/vulnerability/57b0dd3f-bd83-4fb7-b98d-c999026910cd/)

## Related threats

- [MasterStudy LMS privilege escalation in user enrollment](https://junglewise.ai/threats/cve-2026-88849-the-masterstudy-lms-wordpress-plugin-wordpress-plugin-before-3-7)
- [MasterStudy LMS authorization bypass in course progress recording](https://junglewise.ai/threats/cve-2026-88847-the-masterstudy-lms-wordpress-plugin-wordpress-plugin-before-3-7)
- [MasterStudy LMS WordPress plugin authorization bypass in demo import](https://junglewise.ai/threats/cve-2026-88845-the-masterstudy-lms-wordpress-plugin-wordpress-plugin-before-3-7)
- [MasterStudy LMS stored HTML injection in course discussions](https://junglewise.ai/threats/cve-2026-81338-the-masterstudy-lms-wordpress-plugin-wordpress-plugin-before-3-7)