# CVE-2026-81197: MasterStudy LMS information disclosure in REST API

Source: https://junglewise.ai/threats/cve-2026-81197-masterstudy-lms-information-disclosure-in-rest-api  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-02. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-81197 · Severity: medium · CVSS 5.3 · Published 2026-09-02

MasterStudy LMS is a WordPress plugin that manages online learning courses. An unauthenticated attacker can access a public REST API endpoint to discover the titles and IDs of unpublished courses (drafts, pending, and private), which should only be visible to authorized administrators or instructors. This could expose confidential course information and assist attackers in enumerating system users.

## Quick answers

**Is CVE-2026-81197 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-81197 being exploited in the wild.

**How severe is CVE-2026-81197?** Medium severity, with a CVSS score of 5.3, published 2 September 2026.

**Which products and versions are affected?** MasterStudy MasterStudy LMS before 3.7.46.

**Is there a fix for CVE-2026-81197?** A patch was published on 2026-09-02: Version 3.7.46 fixes the vulnerability Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-81197 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-81197?** Check whether anything you run is named in the advisory. 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 fails to implement authentication checks or publication status filtering on the /wp-json/lms/stm-lms-user/course-list REST endpoint. An unauthenticated attacker can make HTTP GET requests with an author_id parameter to retrieve all courses by that user, bypassing the front-end access controls that hide unpublished content. The vulnerability allows enumeration of both course metadata and user IDs across the WordPress installation. This is a sensitive data exposure flaw (CWE-200) accessible over the network without authentication. The issue is resolved in version 3.7.46.

## Affected products

- MasterStudy MasterStudy LMS before 3.7.46

## Timeline

- 2026-08-31: disclosed
- 2026-09-02: patched: Version 3.7.46 fixes the vulnerability

## References

- [https://wpscan.com/vulnerability/8738320c-eb44-46b9-b809-b5cb786cb3e4/](https://wpscan.com/vulnerability/8738320c-eb44-46b9-b809-b5cb786cb3e4/)