# CVE-2026-129251: hrshadhin CloudSchool Event Description EventController.php cross site scripting

Status: published. Published: 2026-11-14. Updated: 2026-11-14.

A vulnerability was detected in hrshadhin CloudSchool up to 3.0.1. This affects an unknown function of the file app/Http/Controllers/Backend/EventController.php of the component Event Description Handler. The manipulation of the argument data results in cross site scripting. It is possible to launch the attack remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- hrshadhin / CloudSchool: 3.0.0 (affected); 3.0.1 (affected). Source: CNA: VulDB

## Severity and prioritization

- CVSS 4.0: 4.8 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P; source: CNA: VulDB

- CVSS 3.1: 2.4 (low); CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 3.0: 2.4 (low); CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:P/RL:X/RC:C; source: CNA: VulDB

- CVSS 2.0: 3.3 (low); AV:N/AC:L/Au:M/C:N/I:P/A:N/E:POC/RL:ND/RC:C; source: CNA: VulDB

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-79, CWE-94

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://vuldb.com/vuln/437281 (CNA: VulDB; vdb-entry, technical-description)

- https://vuldb.com/vuln/437281/cti (CNA: VulDB; signature, permissions-required)

- https://vuldb.com/cve/CVE-2026-129251 (CNA: VulDB; third-party-advisory)

- https://vuldb.com/submit/1042948 (CNA: VulDB; third-party-advisory)

## Provenance

- CNA: VulDB: https://www.cve.org/CVERecord?id=CVE-2026-129251; retrieved 2026-11-14; source updated 2026-11-14

Revision: 5bd8f013a8b20a6f61a833c0d2ce1e99d918840175ca44ae7aee850cda04af0d

Canonical: https://y2.dev/cve/CVE-2026-129251

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