CVE-2026-27591

9.9 CRITICAL
Published: March 11, 2026 Modified: March 19, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/wintercms/winter/security/advisories/GHSA-pgpf-m8m4-6cg6
Source: security-advisories@github.com
Patch Vendor Advisory
https://wintercms.com/releases/v1.0.477
Source: security-advisories@github.com
Release Notes
https://wintercms.com/releases/v1.1.12
Source: security-advisories@github.com
Release Notes
https://wintercms.com/releases/v1.2.12
Source: security-advisories@github.com
Release Notes

4 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.9 / 10.0
EPSS (Exploit Probability)
0.1%
19th percentile
Exploitation Status
Not in CISA KEV

Affected Vendors

wintercms