Quick answers
- Is CVE-2026-81338 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-81338 being exploited in the wild.
- How severe is CVE-2026-81338?
- Medium severity, with a CVSS score of 4.6, published 23 September 2026.
- Which products and versions are affected?
- MasterStudy LMS before 3.7.50.
- Is there a fix for CVE-2026-81338?
- A patch was published on 2026-09-23: 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-2026-81338 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-81338?
- 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 does not sanitize or restrict HTML in user-submitted content before storing and rendering it in course discussions. Subscribers and above-level WordPress users can inject arbitrary HTML and embed iframes, which persists and affects all subsequent viewers. The vulnerability requires user interaction from site visitors viewing the injected content, enabling phishing and content spoofing attacks.
Affected products
- MasterStudy MasterStudy LMS before 3.7.50
Timeline
- 2026-09-21: disclosed
- 2026-09-23: patched: Fixed in version 3.7.50