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 creating or editing blog posts within the Categories section. An attacker can inject a malicious JavaScript payload into the Categories content, which is then stored server-side. This stored payload is later rendered unsafely when the Categories are viewed via blog posts, without proper output encoding, leading to stored cross-site scripting (XSS). This issue has been patched in version 0.31.0.0.

Affected: Packagist: ci4-cms-erp/ci4ms

# Summary ### **Vulnerability: Blogs Posts (Categories) Full Account Takeover for All-Roles & Privilege-Escalation via Stored DOM XSS** - Stored Cross-Site Scripting via Unsanitized Blog Post Content in Blog Management (Categories)

### Description The application fails to properly sanitize user-controlled input when creating or editing blog posts within the **Categories** section. An attacker can inject a malicious JavaScript payload into the **Categories** content, which is then stored server-side.

This stored payload is later rendered unsafely when the **Categories** are viewed via blog posts, without proper output encoding, leading to stored cross-site scripting (XSS).

### Affected Functionality - Blog post **Categories** creation functionality - Blog post **Categories** editing functionality - Blog post **Categories** storage and retrieval logic

### Attack Scenario - An attacker creates or edits a blog post **Category** to include a malicious XSS payload in the category description or name. - The application stores this content without sanitization or encoding. - The payload persists and executes whenever the category is viewed within the blog posts section, leading to the execution of arbitrary JavaScript in the victim’s browser.

### Impact - Persistent Stored XSS - Execution of arbitrary JavaScript in victims’ browsers - Privilege escalation when viewed by administrators or privileged users within the **Categories** functionality - Full administrator account tak…