CVE-2026-27591 Details
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.
A privilege escalation vulnerability has been identified in Winter CMS versions prior to 1.0.477, 1.1.12, and 1.2.12. This vulnerability allows authenticated backend users to increase their access level by manipulating the roles and permissions assigned to their accounts. The issue arises from the ability to send specially crafted requests to the backend while logged in. To exploit this vulnerability, an attacker must have access to the backend with a user account that has any level of access.
Users are advised to update Winter CMS to version 1.0.477, 1.1.12, or 1.2.12. If an immediate upgrade is not possible, the changes from these releases can be applied manually to resolve the issue.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 12, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6 | [email protected] | PatchVendor Advisory |
| https://wintercms.com/releases/v1.0.477 | [email protected] | Release Notes |
| https://wintercms.com/releases/v1.1.12 | [email protected] | Release Notes |
| https://wintercms.com/releases/v1.2.12 | [email protected] | Release Notes |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-284 | Improper Access Control | [email protected] |
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
| CWE-915 | Improperly Controlled Modification of Dynamically-Determined Object Attributes | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wintercms winter | < 1.0.477 >= 1.1.0, < 1.1.12 >= 1.2.0, < 1.2.12 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 19, 2026 | Initial Analysis | [email protected] |
| Mar 11, 2026 | New CVE Received | [email protected] |