CVE-2026-100877

Received Received - Intake

Cross-Site Scripting in CloudClassroom PHP Project

Publication date: 2026-09-27

Last updated on: 2026-09-27

Assigner: VulDB

Description

A vulnerability was determined in mathurvishal CloudClassroom-PHP-Project up to 5dadec098bfbbf3300d60c3494db3fb95b66e7be. Affected by this vulnerability is an unknown functionality of the file registrationform.php. Executing a manipulation of the argument FName/LName/Addrs can lead to cross site scripting. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. This product implements a rolling release for ongoing delivery, which means version information for affected or updated releases is unavailable. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-27

Last Modified

2026-09-27

Generated

2026-09-28

AI Q&A

2026-09-28

EPSS Evaluated

N/A

NVD

CVE-2026-100877

EUVD

EUVD-2026-88014

Affected Vendors & Products

Vendor	Product	Version / Range
mathurvishal	cloudclassroom-php-project	to 5dadec098bfbbf3300d60c3494db3fb95b66e7be (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CWE-94	The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment.

Attack-Flow Graph

Executive Summary

This vulnerability is a cross-site scripting (XSS) issue in the mathurvishal CloudClassroom-PHP-Project. It exists in the registrationform.php file where the FName, LName, and Addrs arguments can be manipulated to execute malicious scripts. The attack is possible remotely and has been publicly disclosed.

Detection Guidance

To detect this vulnerability, inspect the registrationform.php file for improper input validation in the FName, LName, and Addrs parameters. Look for reflected or stored cross-site scripting (XSS) patterns in user input handling. Use tools like grep to search for suspicious patterns in web server logs or application code.

Impact Analysis

An attacker could exploit this to inject malicious scripts into web pages viewed by users. This may lead to theft of session cookies, account takeover, or defacement of the website. Users interacting with the affected form could unknowingly execute harmful code.

Compliance Impact

This XSS vulnerability could compromise user data confidentiality, potentially violating GDPR's data protection requirements. For HIPAA, it may risk protected health information exposure if user sessions are hijacked. Both standards emphasize protecting user data integrity and confidentiality.

Mitigation Strategies

Immediately sanitize user inputs for FName, LName, and Addrs parameters in registrationform.php. Implement strict input validation and output encoding. Update the application to reject or escape special characters. Consider disabling the affected functionality until a patch is available.

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