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OpenAdvisories
Critical · 10.0 CVE-2026-27591 EUVD-2026-11406GHSA-pgpf-m8m4-6cg6

Winter: Privilege escalation by authenticated backend users

Published Mar 11, 2026 · Updated Mar 12, 2026 · Assigned by GitHub_M

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.

Affected products

VendorProductAffectedFixed
wintercms winter >= 1.2.0, < 1.2.12, >= 1.1.0, < 1.1.12, < 1.0.477 —

Affected packages

EcosystemPackageAffectedFixedRecord
Packagist winter/wn-backend-module >= 1.2.0, < 1.2.12 1.2.12 GHSA-pgpf-m8m4-6cg6
Packagist winter/wn-backend-module >= 1.1.0, < 1.1.12 1.1.12 GHSA-pgpf-m8m4-6cg6
Packagist winter/wn-backend-module < 1.0.477 1.0.477 GHSA-pgpf-m8m4-6cg6

References