# CVE-2026-100876: CloudClassroom-PHP-Project authentication bypass in loginlinkstudent.php

Source: https://junglewise.ai/threats/cve-2026-100876-a-vulnerability-was-found-in-mathurvishal-cloudclassroom-php  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-27. Updated: 2026-09-27  
License: CC BY 4.0 with a link back

CVE-2026-100876 · Severity: medium · CVSS 6.3 · Published 2026-09-27

CloudClassroom-PHP-Project is a PHP-based classroom management application. A missing authentication vulnerability in the loginlinkstudent.php file allows attackers to manipulate the umail parameter and bypass login controls, potentially gaining unauthorized access to student accounts and educational data without valid credentials.

Technologies: [Mathurvishal CloudClassroom PHP Project](https://junglewise.ai/threats/technologies/mathurvishal-cloudclassroom-php-project). Vendors: [Mathurvishal](https://junglewise.ai/threats/vendors/mathurvishal).

## Quick answers

**Is CVE-2026-100876 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100876 being exploited in the wild.

**How severe is CVE-2026-100876?** Medium severity, with a CVSS score of 6.3, published 27 September 2026.

**Which products and versions are affected?** Mathurvishal CloudClassroom PHP Project up to commit 5dadec098bfbbf3300d60c3494db3fb95b66e7be.

**Is there a fix for CVE-2026-100876?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-100876 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-100876?** Check whether you run Mathurvishal CloudClassroom PHP Project at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in loginlinkstudent.php where the umail parameter is processed without proper authentication validation, allowing direct manipulation to bypass login checks. Remote exploitation is possible without authentication or user interaction required. An attacker can gain unauthorized access to student accounts and associated classroom data.

## Affected products

- mathurvishal CloudClassroom-PHP-Project up to commit 5dadec098bfbbf3300d60c3494db3fb95b66e7be

## Timeline

- 2026-09-27: disclosed
- other: Exploit code made public; vendor did not respond to early disclosure notification

## References

- [https://github.com/rmsbpro/Advisory/blob/main/broken-role-segregation.md](https://github.com/rmsbpro/Advisory/blob/main/broken-role-segregation.md)
- [https://vuldb.com/cve/CVE-2026-100876](https://vuldb.com/cve/CVE-2026-100876)

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