Is CVE-2026-100877 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-100877 being exploited in the wild.

How severe is CVE-2026-100877?

Medium severity, with a CVSS score of 4.3, published 27 September 2026.

Which products and versions are affected?

Mathurvishal CloudClassroom PHP Project up to commit 5dadec098bfbbf3300d60c3494db3fb95b66e7be.

Is there a fix for CVE-2026-100877?

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-2026-100877 attacked?

It is attacked over the network.

Am I affected by CVE-2026-100877?

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.

CVE-2026-100877: CloudClassroom-PHP-Project stored XSS in registration form

CVE-2026-100877 · Severity: medium · CVSS 4.3 · Published 2026-09-27

CloudClassroom-PHP-Project is a student management application with a public registration form. An unauthenticated attacker can inject malicious scripts into student registration fields (first name, last name, address) that are executed when other users view student details, enabling account takeover, session hijacking, or credential theft.

Technologies: Mathurvishal CloudClassroom PHP Project. Vendors: Mathurvishal.

Quick answers

Is CVE-2026-100877 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-100877 being exploited in the wild.
How severe is CVE-2026-100877?: Medium severity, with a CVSS score of 4.3, published 27 September 2026.
Which products and versions are affected?: Mathurvishal CloudClassroom PHP Project up to commit 5dadec098bfbbf3300d60c3494db3fb95b66e7be.
Is there a fix for CVE-2026-100877?: 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-2026-100877 attacked?: It is attacked over the network.
Am I affected by CVE-2026-100877?: 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

Stored cross-site scripting vulnerability in registrationform.php where user-supplied input parameters (FName, LName, Addrs) are stored without sanitization and reflected in studentdetails.php without proper encoding. An unauthenticated attacker can inject JavaScript payloads via self-registration that execute in the browsers of users viewing student profiles. The vulnerability requires no authentication or user interaction beyond normal application use.

Affected products

mathurvishal CloudClassroom-PHP-Project up to commit 5dadec098bfbbf3300d60c3494db3fb95b66e7be

Timeline

2026-09-27: disclosed
2026-09-27: advisory: Public advisory released; vendor did not respond to early disclosure notification

References

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