CVE-2026-129251: hrshadhin CloudSchool Event Description EventController.php cross site scripting
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.
Affected Software
Event History
Frequently Asked Questions
What level of access and interaction are required for exploitation?
The attacker needs high privileges and must induce user interaction. The attack can be launched remotely once those conditions are met.
Which deployments should be checked?
hrshadhin CloudSchool deployments running version 3.0.1 or earlier should be reviewed, particularly use of the Event Description Handler.
How urgent is triage if the product is in use?
A public exploit is available, so affected deployments should be prioritized for review despite the low severity rating.