CVE-2026-100876
Received Received - Intake

Authentication Bypass in CloudClassroom PHP Project

Publication date: 2026-09-27

Last updated on: 2026-09-27

Assigner: VulDB

Description
A vulnerability was found in mathurvishal CloudClassroom-PHP-Project up to 5dadec098bfbbf3300d60c3494db3fb95b66e7be. Affected is an unknown function of the file loginlinkstudent.php. Performing a manipulation of the argument umail results in missing authentication. Remote exploitation of the attack is possible. The exploit has been made public and could be used. This product follows a rolling release approach for continuous delivery, so version details for affected or updated releases are not provided. The vendor was contacted early about this disclosure but did not respond in any way.

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Meta Information

Published
2026-09-27
Last Modified
2026-09-27
Generated
2026-09-28
AI Q&A
2026-09-27
EPSS Evaluated
N/A
NVD
CVE-2026-100876
EUVD
EUVD-2026-88012

Affected Vendors & Products

Currently, no data is known.

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-287 When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Attack-Flow Graph

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Executive Summary

CVE-2026-100876 is a vulnerability in CloudClassroom-PHP-Project where a low-privilege student account can manipulate session variables to bypass authentication and gain admin or faculty privileges. This occurs due to missing function-level access control and improper role verification in admin/faculty pages.

Detection Guidance

Check for unauthorized access to admin or faculty pages by reviewing server logs for requests to loginlinkstudent.php with manipulated umail parameters. Inspect session variables for improper role escalation attempts. Monitor for unusual account creation or privilege changes.

Impact Analysis

An attacker could exploit this to read sensitive data like PII and credentials, modify or delete records, create new accounts, and gain full control over the system. The vulnerability allows vertical privilege escalation from a low-privilege account.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR and HIPAA requirements for data protection and access control. Non-compliance risks include legal penalties and reputational damage.

Mitigation Strategies

Implement strict role-based access control and add exit statements after role verification checks. Restrict access to admin and faculty pages to authorized users only. Temporarily disable self-registration for student accounts until a patch is available.

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