CVE-2026-35445

CVE-2026-35445 · Winter: Authenticated backend users can bypass Users controller permission checks

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Winter CMS is a content management system built on the Laravel PHP framework. In versions prior to 1.2.13, the backend did not validate the handler name submitted through the form postback _handler POST field, allowing an authenticated backend user to invoke arbitrary controller methods, including protected, private, and action-prefixed ones. While AJAX requests validate that handler names match the on[A-Z][\w+]* pattern, the postback path passed the submitted _handler value straight to the handler dispatcher with no such check, so any controller that exposes a public action or conditionally relaxes its $requiredPermissions check could be reached, bypassing the roles and permissions system. The built-in Users controller was affected because it set $requiredPermissions to null for the myaccount action, letting any authenticated backend user invoke user-management methods such as update_onDelete and update_onManualPasswordReset without holding the backend.manage_users permission. This issue is fixed in version 1.2.13.

CVSS 7.1 · High · EPSS 0.4% · Fix available

Published

2026-08-26T16:40:51.500Z

Updated

2026-08-26T19:08:44.974Z

Stack: php

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