Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.0.477, 1.1.12, and 1.2.12, Winter CMS allowed authenticated backend users to escalate their accounts level of access to the system by modifying the roles / permissions assigned to their account through specially crafted requests to the backend while logged in. To actively exploit this security issue, an attacker would need access to the Backend with a user account with any level of access. This vulnerability is fixed in 1.0.477, 1.1.12, and 1.2.12.
The vulnerability results from improper access control (CWE-284) and insecure direct object reference in role management (CWE-639), as well as mass assignment vulnerability (CWE-915). A logged-in backend user could send crafted HTTP requests to the administrative interface, modifying parameters responsible for assigning roles and permissions to their own account, thereby bypassing authorization mechanisms.
An attacker with any level of backend access could escalate their privileges to the highest level in the system, which in practice means complete takeover of the CMS instance, including access to data, configuration, and content management.
Winter CMS should be updated to version 1.0.477, 1.1.12, or 1.2.12 according to the branch used in the production environment. Detailed information available at: wintercms.com/releases/v1.0.477, wintercms.com/releases/v1.1.12, wintercms.com/releases/v1.2.12
Winter CMS in versions prior to 1.0.477, 1.1.12, and 1.2.12
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HWintercms Winter
APPWintercms< 1.0.4771.1.0 – 1.1.12 (bez)1.2.0 – 1.2.12 (bez)
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