CVE-2026-27591
Last modified
CVE-2026-27591 is a critical-severity vulnerability rated 9.9/10 on the CVSS scale. 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. EPSS estimates a 0.49% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Wintercms | Winter | < 1.0.477 |
| Wintercms | Winter | >= 1.1.0, < 1.1.12 |
| Wintercms | Winter | >= 1.2.0, < 1.2.12 |
References
- https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6Patch, Vendor Advisory
- https://wintercms.com/releases/v1.0.477Release Notes
- https://wintercms.com/releases/v1.1.12Release Notes
- https://wintercms.com/releases/v1.2.12Release Notes
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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