Quick answers
- Is CVE-2026-81196 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-81196 being exploited in the wild.
- How severe is CVE-2026-81196?
- Low severity, with a CVSS score of 2.7, published 2 September 2026.
- Which products and versions are affected?
- MasterStudy LMS before 3.7.46.
- Is there a fix for CVE-2026-81196?
- A patch was published on 2026-08-31: Fixed in version 3.7.46 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-81196 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-81196?
- 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
This is an Insecure Direct Object Reference (IDOR) vulnerability in the MasterStudy LMS plugin's REST API endpoints for quiz management. The vulnerability exists in the /wp-json/masterstudy-lms/v2/quizzes/{id}/questions endpoint, which does not validate that the authenticated instructor owns the quiz before allowing attachment and retrieval of question objects. An instructor can create their own quiz, attach a victim instructor's question ID to it via a PUT request, and then retrieve the full question details including the correct answers and explanations. The attack requires an instructor-level account but no additional user interaction. The vulnerability was fixed in version 3.7.46.
Affected products
- MasterStudy LMS before 3.7.46
Timeline
- 2026-08-31: disclosed: Publicly published on WPScan
- 2026-08-31: patched: Fixed in version 3.7.46