What the vulnerability does
01Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in masteriyo Masteriyo - LMS learning-management-system allows Stored XSS.This issue affects Masteriyo - LMS: from n/a through <= 1.18.3.
Explanation of Vulnerability in Simple Terms
02Summary
Masteriyo LMS versions up to 1.18.3 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts. When a victim visits a page containing the attacker's payload, the script executes in their browser with their permissions. The vulnerability affects the site's integrity and can compromise user sessions or data.
What an attacker can do
03Attacker Capabilities
Inject malicious JavaScript that runs in other users' browsers when they view affected pages.
Potential impact on your site
04Site Impact
Authenticated users can inject scripts affecting other users' sessions, data, or site functionality.
Conditions required to exploit
05Prerequisites
Attacker must have a user account with low privileges; victim must visit a page containing the malicious payload.
Key dates
06Disclosure timeline
August 14, 2025
CVE published
April 28, 2026
Record updated