Cross Site Scripting Vulnerability in CloudClassroom-PHP-Project by mathurvishal
CVE-2026-100877

5.3MEDIUM

Key Information:

Vendor

Mathurvishal

Status
Cloudclassroom-PHP-project
Vendor
CVE Published:
27 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-100877?

A vulnerability exists in the CloudClassroom-PHP-Project, specifically in the functionality of registrationform.php. This flaw allows for cross site scripting via manipulation of the FName, LName, and Addrs arguments. Due to this vulnerability, remote attackers could execute malicious scripts, putting user data at risk. The issue has been publicly disclosed, and the vendor has not responded to outreach efforts regarding this security concern.

Affected Version(s)

CloudClassroom-PHP-Project 5dadec098bfbbf3300d60c3494db3fb95b66e7be

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-100877 - Proof of Concept

References

https://vuldb.com/vuln/410807
vdb-entrytechnical-description
https://vuldb.com/vuln/410807/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-100877
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

rmsbpro (VulDB User)
VulDB CNA Team
.