CVE-2026-27591
Winter: Privilege escalation by authenticated backend users
CVSS Score
10.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-284 CWE-639 CWE-915 |
| Vendor | wintercms |
| Product | winter |
| Published | Mar 11, 2026 |
| Last Updated | Mar 12, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
wintercms / winter
>= 1.2.0, < 1.2.12 >= 1.1.0, < 1.1.12 < 1.0.477