Medium severity · published Sep 27, 2026
CVE-2026-100877
mathurvishal CloudClassroom-PHP-Project registrationform.php cross site scripting
4.3
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CL
CloudClassroom-PHP-Project · mathurvishal
5dadec098bfbbf3300d60c3494db3fb95b66e7be · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-100877
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-100877
vdb-entry
https://vuldb.com/vuln/410807
signature
https://vuldb.com/vuln/410807/cti
third-party-advisory
https://vuldb.com/cve/CVE-2026-100877
third-party-advisory
https://vuldb.com/submit/915444
exploit
https://github.com/rmsbpro/Advisory/blob/main/registrationform-stored-xss.md
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