CVE-2026-81338 MasterStudy LMS < 3.7.50 - Subscriber+ Stored HTML Injection via Course Discussions
Subscribers can inject malicious HTML into course discussions, enabling phishing and content spoofing against other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-81338?
CVE-2026-81338 is a medium-severity cross-site scripting vulnerability in Unknown MasterStudy LMS WordPress Plugin, published on 23 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
The MasterStudy LMS WordPress Plugin WordPress plugin before 3.7.50 does not properly sanitise and restrict HTML in user-submitted content before storing it and rendering it to other users, allowing users with subscriber-level accounts and above to perform stored HTML injection, such as embedding iframes, that can be leveraged for phishing and content spoofing against other users viewing the content.
Weakness: CWE-345
Which versions are affected by CVE-2026-81338?
How do I fix CVE-2026-81338?
No fix has been published for CVE-2026-81338 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-81338 being exploited?
There is no known exploitation of CVE-2026-81338 in the wild and no public exploit code.
Sources
Also known as GHSA-xc92-96mw-2hrx.