CVE-2026-100313 in CloudClassroom-PHP-Project
Summary
by MITRE • 09/26/2026
A weakness has been identified in mathurvishal CloudClassroom-PHP-Project up to 5dadec098bfbbf3300d60c3494db3fb95b66e7be. This affects an unknown function of the file updatequery.php. Executing a manipulation of the argument queryx can lead to cross site scripting. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. This product takes the approach of rolling releases to provide continious delivery. Therefore, version details for affected and updated releases are not available. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 09/26/2026
The identified vulnerability resides within the CloudClassroom-PHP-Project, a web-based educational platform that utilizes PHP for server-side processing. Specifically, the flaw is located in the updatequery.php file and affects an unspecified function responsible for handling database updates or query executions. The core technical issue stems from insufficient input validation and sanitization of the queryx argument passed to this function. When user-supplied data is not properly escaped before being processed or reflected back into the web page, it allows attackers to inject malicious scripts. This specific weakness aligns with CWE-79, commonly known as Improper Neutralization of Input During Web Page Generation, which covers Cross-Site Scripting (XSS) vulnerabilities. The lack of proper encoding means that arbitrary JavaScript code can be executed in the context of a victim's browser session.
The operational impact of this vulnerability is significant due to its remote exploitability and the nature of XSS attacks. An attacker can craft a malicious link or embed script within content posted on the platform, which triggers when another user views it. Successful exploitation allows for session hijacking, where attackers steal authentication cookies to impersonate legitimate users. It also enables credential harvesting through fake login forms injected into the page, defacement of the application interface, and potentially redirecting victims to phishing sites or malware distribution platforms. Since the product employs a rolling release model with continuous delivery, there are no discrete version numbers that can be referenced for patch verification. This complicates remediation efforts as administrators cannot simply upgrade to a specific fixed version but must instead monitor vendor announcements for code updates or apply manual patches if source access is available.
The security posture of the project is further compromised by the public availability of exploit code and the vendor's lack of response to disclosure attempts. The existence of publicly accessible exploits lowers the barrier to entry for less skilled attackers, increasing the likelihood of automated attacks against instances running affected versions. Furthermore, the vendor’s failure to respond to early contact regarding this critical security flaw indicates a potential gap in their vulnerability management lifecycle. This absence of communication leaves users without official guidance on mitigation strategies or timelines for fixes. Industry standards such as MITRE ATT&CK classify these actions under techniques like T1059 (Command and Scripting Interpreter) when scripts are executed, and T1078 (Valid Accounts) if session tokens are stolen to gain unauthorized access.
To mitigate the risks associated with this vulnerability, immediate action is required from system administrators and developers. The primary remediation step involves implementing strict input validation on all user-supplied data, particularly parameters like queryx that interact with backend processes or output mechanisms. Developers should employ context-aware encoding techniques, such as HTML entity encoding for data rendered in web pages, to ensure special characters are treated as literal text rather than executable code. Additionally, deploying a Web Application Firewall (WAF) can provide an additional layer of defense by filtering out known malicious payloads before they reach the application logic. Given the rolling release nature of the software, users should regularly check for source code updates or patches released by the vendor and apply them promptly once available. Until official fixes are provided, restricting access to the platform to trusted users only can reduce the attack surface significantly.