Winter: Stored XSS through Brand Settings custom styles

Impact Users with the backend.managebranding "Customize the back-end" permission can provide custom CSS through Settings → Customize Backend → Styles that is compiled through the LESS CSS parser and rendered on every backend page. Previously, the compiled output was not sanitized, which could hav...

Cross-site Scripting (XSS)

Overview october/system is a System module for October CMS. Affected versions of this package are vulnerable to Cross-site Scripting XSS via the stylesheet input in the backend branding and appearance configuration. An attacker can execute arbitrary scripts in the context of backend users by...