CVE-2026-42702 in Tutor LMS Plugin
Summary
by MITRE • 10/10/2026
Unauthenticated Cross Site Scripting (XSS) in Tutor LMS <= 4.1.0 versions.
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Analysis
by VulDB Data Team • 10/10/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within Tutor LMS versions prior to 4.1.0 represents a significant security risk for platforms utilizing this learning management system software. Cross-site scripting, commonly referred to by its acronym XSS, is a web security漏洞 that allows attackers to inject malicious scripts into web pages viewed by other users. In the specific context of Tutor LMS, which serves as a robust platform for creating and selling online courses, such vulnerabilities can compromise not only individual user accounts but also the integrity of the entire educational ecosystem hosted on the application. The classification of this vulnerability as unauthenticated is particularly severe because it implies that an attacker does not need valid credentials or prior access to exploit the flaw. This lowers the barrier to entry significantly, allowing any internet user with basic knowledge of web technologies and malicious intent to initiate an attack without needing to bypass login mechanisms or session management controls.
The technical root cause of this vulnerability typically stems from insufficient input validation and output encoding within the application's codebase. When a user submits data through various forms, query parameters, or API endpoints in Tutor LMS versions up to 4.1.0, the system fails to properly sanitize the incoming information before processing it or displaying it back to other users. This lack of sanitization allows malicious JavaScript code to be embedded within seemingly benign input fields. When another user views a page containing this injected script, their browser executes the code in the context of the vulnerable application. Because the script runs with the same privileges as the legitimate application, the attacker can perform actions on behalf of the victim, access sensitive data such as session cookies or personal information, and manipulate the content displayed to other users. This mechanism aligns closely with CWE-79, which is the Common Weakness Enumeration identifier for Improper Neutralization of Input During Web Page Generation, a standard classification used by security professionals worldwide to categorize injection-based vulnerabilities.
The operational impact of this vulnerability extends far beyond simple defacement or minor annoyances. An attacker can leverage this flaw to conduct session hijacking attacks by stealing authentication cookies stored in the victim's browser. With these cookies, the attacker can impersonate legitimate users, including instructors and administrators, gaining unauthorized access to course materials, student data, and administrative settings. Furthermore, the vulnerability enables phishing campaigns where attackers can create fake login forms or redirect victims to malicious sites designed to harvest credentials. In a learning management system context, this could lead to the theft of sensitive personal information belonging to students and educators, such as names, email addresses, and potentially payment details if integrated with e-commerce plugins. The ability to execute arbitrary JavaScript also allows for keylogging capabilities, where every keystroke made by a victim within the application is captured and sent back to the attacker's server, further exacerbating the risk of data breach and identity theft.
From a strategic perspective, this vulnerability maps directly to several techniques in the MITRE ATT&CK framework, which provides a knowledge base of adversary tactics and techniques based on real-world observations. Specifically, it relates to T1059, Command and Scripting Interpreter, as JavaScript is often used for client-side execution. It also aligns with T1204, User Execution, because the attack relies on a user interacting with or viewing content containing the malicious script. Additionally, if cookie theft occurs, it falls under T1539, Steal Web Session Cookie, highlighting the potential for lateral movement and privilege escalation within the application environment. Understanding these mappings helps security teams prioritize remediation efforts based on the broader threat landscape and common attack patterns observed in modern web applications.
Mitigation strategies must focus on immediate patching and long-term secure coding practices. The primary and most effective solution is to upgrade Tutor LMS to version 4.1.0 or later, where these input validation issues have been addressed by the development team. Organizations running older versions should prioritize this update as part of their emergency vulnerability management protocols. In addition to patching, implementing a Web Application Firewall can provide an additional layer of defense by filtering and monitoring HTTP traffic between the web application and the internet, potentially blocking malicious payloads before they reach the vulnerable code. Security teams should also enforce strict Content Security Policy headers to restrict the sources from which scripts can be loaded and executed, thereby mitigating the impact even if a script injection attempt succeeds. Regular security audits, static code analysis, and penetration testing are essential for identifying similar flaws in other parts of the application before they can be exploited by malicious actors.