CVE-2026-120343 in CloudClassroom-PHP-Project
Summary
by MITRE • 11/02/2026
A flaw has been found in mathurvishal CloudClassroom-PHP-Project. The impacted element is an unknown function of the file manageassessment2.php. This manipulation of the argument ExamName/Q1/Q2/Q3/Q4/Q5 causes cross site scripting. The attack is possible to be carried out remotely. The exploit has been published and may be used. This product adopts a rolling release strategy to maintain continuous delivery. Therefore, version details for affected or updated releases cannot be specified. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 11/02/2026
The vulnerability identified within the mathurvishal CloudClassroom-PHP-Project represents a significant security risk due to its potential for remote exploitation and direct impact on user data integrity through cross-site scripting attacks. The flaw resides specifically within an unknown function located in the manageassessment2.php file, which serves as a critical component of the application's assessment management interface. This module is responsible for handling input related to exam names and individual question content, indicated by parameters such as ExamName/Q1/Q2/Q3/Q4/Q5. The core technical deficiency lies in the insufficient sanitization or validation of these user-supplied arguments before they are processed or rendered back into the web page context. By failing to properly escape special characters that have semantic meaning in HTML and JavaScript, the application allows an attacker to inject malicious scripts directly into the response stream returned to legitimate users.
From a technical perspective, this vulnerability is classified under CWE-79, which denotes Improper Neutralization of Input During Web Page Generation commonly known as Cross-Site Scripting or XSS. The specific nature of this flaw suggests it may be categorized further as Reflected XSS if the malicious payload is immediately executed in response to a request without being stored on the server, although persistent storage cannot be entirely ruled out depending on how the application handles subsequent requests for these assessment details. In either case, the lack of output encoding allows arbitrary JavaScript code to execute within the victim's browser session under the context of the vulnerable domain. This bypasses same-origin policy protections and grants the injected script full access to cookies, local storage, session tokens, and other sensitive data associated with the user's active login state on the CloudClassroom platform.
The operational impact of this vulnerability is severe due to its remote exploitability. An attacker can craft a malicious link or embed the payload within another web page that directs an authenticated victim to interact with the compromised manageassessment2.php endpoint. Once executed, the script can perform actions such as stealing session cookies to hijack user accounts, redirecting users to phishing sites designed to harvest credentials, defacing the application interface, or performing unauthorized administrative actions if the targeted user possesses elevated privileges. Given that this product adopts a rolling release strategy for continuous delivery, version tracking is not feasible in traditional terms, meaning all current and potentially past releases are susceptible until specific patches are applied and deployed by the vendor. The absence of defined version boundaries complicates vulnerability management efforts for organizations relying on this software, as they cannot easily determine which instances require immediate remediation based on standard versioning schemes.
Furthermore, the response from the vendor adds a layer of risk to the ecosystem surrounding this application. Despite being contacted early regarding this disclosure, there has been no acknowledgment or resolution provided by the maintainers. This lack of communication suggests that existing deployments remain exposed indefinitely unless users implement their own defensive measures. The fact that an exploit has already been published increases the likelihood of automated scanning and opportunistic attacks against publicly accessible instances of CloudClassroom-PHP-Project. Security teams must treat this as a high-priority issue requiring immediate mitigation strategies rather than waiting for vendor intervention, especially given the public availability of proof-of-concept code that demonstrates successful exploitation.
To mitigate these risks, several defensive measures should be implemented immediately at both the application and infrastructure levels. At the application layer, developers must enforce strict input validation on all fields related to ExamName and question content Q1 through Q5, ensuring that only expected alphanumeric characters and safe punctuation are accepted while rejecting or encoding any HTML special characters such as angle brackets, quotes, and ampersands. Output encoding is equally critical; data rendered in the browser context should be encoded using appropriate methods like HTML entity encoding to prevent script execution. Additionally, implementing a Content Security Policy header can significantly reduce the impact of successful XSS attacks by restricting the sources from which scripts are allowed to load or execute, thereby neutralizing many inline script injection attempts even if they bypass input filters.
From an infrastructure perspective, organizations should consider deploying Web Application Firewalls configured with rulesets capable of detecting and blocking common cross-site scripting patterns in HTTP requests targeting the manageassessment2.php endpoint. Regular security audits and static code analysis tools focused on PHP vulnerabilities can help identify similar flaws across other parts of the application before they are exploited. Since the vendor has not responded, stakeholders should evaluate alternative solutions or fork the project to apply community-driven patches if continued use is essential for business operations. Continuous monitoring of threat intelligence feeds related to this specific software package will also aid in anticipating potential attack vectors and adjusting defensive postures accordingly until a permanent fix is established by the development team.