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 when handling backup uploads and processing backup metadata. An attacker can inject a malicious JavaScript payload into the backup filename via the uploaded xss.sql, which uses SQL functionality to insert the XSS payload server-side. This stored payload is later rendered unsafely in multiple backup management views without proper output encoding, leading to stored blind cross-site scripting (Blind XSS). This issue has been patched in version 0.31.0.0.

Affected: Packagist: ci4-cms-erp/ci4ms

## Summary ### **Vulnerability: Stored DOM Blind XSS via Backup Management Filename (Persistent Payload Injection)** - Stored Cross-Site Scripting (Blind XSS) via Unsanitized Backup Filename in Backup Management

### Description The application fails to properly sanitize user-controlled input when handling backup uploads and processing backup metadata. An attacker can inject a malicious JavaScript payload into the backup filename via the uploaded `xss.sql`, which uses SQL functionality to insert the XSS payload server-side.

This stored payload is later rendered unsafely in multiple backup management views without proper output encoding, leading to stored blind cross-site scripting (Blind XSS).

### Affected Functionality - Backup upload functionality - Backup processing functionality - Backup storage and retrieval logic

### Attack Scenario - An attacker uploads `xss.sql` which uses SQL functionality to insert a malicious XSS payload into the backup filename field server-side. - The application stores this filename without sanitization or encoding. - The payload persists and executes whenever the backup filename is rendered in affected views. - The attacker does not see immediate execution, making this a Blind XSS scenario that triggers only when an administrator or privileged user views the backup management panel.

### Impact - Persistent Stored Blind XSS - Execution of arbitrary JavaScript in victims’ browsers - Privilege escalation when viewed by administrators or privi…