CVE-2026-32257: Wintercms Winter

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.2.13, custom CSS supplied through the Brand Settings Styles field by a backend user with the backend.manage_branding permission is compiled by the LESS parser and rendered without sanitization on every backend page, allowing stored cross-site scripting against backend users. This issue is fixed in version 1.2.13.

Affected products

• Wintercms Winter: before 1.2.13 (fixed in 1.2.13)

Published 2026-08-26. Last modified 2026-09-09.