CVE-2026-100877 mathurvishal CVE debrief

Who should care

Defenders responsible for the mathurvishal CloudClassroom-PHP-Project should assess exposure and prioritize verification of this vulnerability in their inventory, given the remote attack vector and potential for cross-site scripting.

Why it matters

CVE-2026-100877 is a cross-site scripting vulnerability in mathurvishal CloudClassroom-PHP-Project that can be exploited remotely. Defenders should prioritize verification of this vulnerability in their inventory and assess exposure.

• Defenders should verify the presence of this vulnerability in their inventory to assess exposure.
• Remote attack vector allows for potential cross-site scripting attacks.
• Compensating controls may be necessary to mitigate the vulnerability.

Technical summary

The vulnerability is located in the registrationform.php file of the mathurvishal CloudClassroom-PHP-Project up to version 5dadec098bfbbf3300d60c3494db3fb95b66e7be. By manipulating the FName, LName, and Addrs arguments, an attacker can execute a cross-site scripting attack remotely. The vulnerability has a CVSS score of 2.1 and a severity of LOW. The vendor did not respond to early disclosure, and version information for affected or updated releases is unavailable due to the rolling release model. Defenders should prioritize verifying the presence of this vulnerability in their inventory and assessing exposure, given the remote attack vector and potential for cross-site scripting.

Defensive priority

Defenders should prioritize verifying the presence of this vulnerability in their inventory and assessing exposure, given the remote attack vector.

Recommended defensive actions

• Verify the presence of this vulnerability in your inventory
• Assess exposure given the remote attack vector
• Consider compensating controls for cross-site scripting
• Review vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Plan for incident response in case of an attack

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its description and CVSS score. However, the vendor did not respond to early disclosure, and version information for affected or updated releases is unavailable due to the rolling release model.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.