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.
History

Thu, 12 Mar 2026 15:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Thu, 12 Mar 2026 10:15:00 +0000

Type Values Removed Values Added
First Time appeared Wintercms
Wintercms winter
Vendors & Products Wintercms
Wintercms winter

Wed, 11 Mar 2026 21:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Winter: Privilege escalation by authenticated backend users
Weaknesses CWE-284
CWE-639
CWE-915
References
Metrics cvssV3_1

{'score': 10, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published: 2026-03-11T21:25:35.289Z

Updated: 2026-03-12T14:23:06.447Z

Reserved: 2026-02-20T17:40:28.451Z

Link: CVE-2026-27591

cve-icon Vulnrichment

Updated: 2026-03-12T14:23:02.378Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-11T22:16:32.290

Modified: 2026-03-12T21:08:22.643

Link: CVE-2026-27591

cve-icon Redhat

No data.