CVE-2026-45138 CI4MS: Stored XSS in Blog Content via Broken `html_purify` Validation Rule

CI4MS is a CodeIgniter 4-based content management system skeleton. Prior to version 0.31.9.0, the custom htmlpurify validation rule used to sanitize blog post bodies relies on by-reference mutation ?string &$str, but CodeIgniter 4's validator passes a local copy of the value, so the sanitized tex...