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 Affected versions of this package are vulnerable to Cross-site Scripting XSS in the custom styles process. An attacker can execute arbitrary scripts in the context of backend users by injecting malicious CSS that is not properly sanitized. This is only exploitable if the attacker has the...

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...