RCE in Mathurvishal Cloudclassroom-Php-Project
CVE-2026-100877
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Mathurvishal Cloudclassroom-Php-Project — versions 5dadec098bfbbf3300d60c3494db3fb95b66e7be
Weakness classification (CWE)
References
- vuldb.com/vuln/410807 (technical-description, vdb-entry)
- vuldb.com/vuln/410807/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-100877 (third-party-advisory)
- vuldb.com/submit/915444 (third-party-advisory)
- github.com/rmsbpro/Advisory/blob/main/registrationform-stored-xss.md (exploit)
Frequently asked questions
- What is CVE-2026-100877?
- CVE-2026-100877 is a medium-severity vulnerability in Mathurvishal Cloudclassroom-Php-Project, classified under Cross-site Scripting. CVSS score: 4.3/10. Published 2026-09-27.
- How severe is CVE-2026-100877?
- Medium severity. CVSS v3 base score is 4.3 out of 10.