CI4MS is a CodeIgniter 4-based CMS skeleton that delivers a production-ready, modular architecture with RBAC authorization and theme support. Prior to version 0.31.0.0, the application fails to properly sanitize user-controlled input within group and role management functionality. Multiple input fields (three distinct group-related fields) can be injected with malicious JavaScript payloads, which are then stored server-side. These stored payloads are later rendered unsafely within privileged administrative views without proper output encoding, leading to stored cross-site scripting (XSS) within the role and permission management context. This issue has been patched in version 0.31.0.0.

Affected: Packagist: ci4-cms-erp/ci4ms

## Summary ### **Vulnerability: Stored DOM XSS via Group / Role Management Fields (Administrative Context Execution)** - Stored Cross-Site Scripting via Unsanitized Group / Role Management Inputs

### Description The application fails to properly sanitize user-controlled input within group and role management functionality. Multiple input fields (three distinct group-related fields) can be injected with malicious JavaScript payloads, which are then stored server-side.

These stored payloads are later rendered unsafely within privileged administrative views without proper output encoding, leading to stored cross-site scripting (XSS) within the role and permission management context.

### Affected Functionality - Group creation and editing functionality - Role and permission assignment interfaces - Storage and retrieval of group-related data

### Attack Scenario - An attacker injects a malicious XSS payload into one or more group-related input fields. - The application stores these values without sanitization or encoding. - An administrator views the group or role management interface. - The payload executes automatically in the administrator’s browser.

### Impact - Persistent Stored XSS - Execution of arbitrary JavaScript in victims’ browsers - Privilege escalation when viewed by administrators - Full administrator account takeover - Full compromise of the entire application

Endpoints: - `/backend/users/groupList/`

## Steps To Reproduce (POC) 1. Navigate to the Group / Rol…