Winter CMS up to 1.0.476/1.1.11/1.2.11 Requests access control

Summaryinfo

A vulnerability labeled as critical has been found in Winter CMS up to 1.0.476/1.1.11/1.2.11. Affected by this issue is some unknown functionality of the component Requests Handler. Executing a manipulation can lead to access control. This vulnerability is handled as CVE-2026-27591. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Winter CMS up to 1.0.476/1.1.11/1.2.11 and classified as critical. This vulnerability affects an unknown part of the component Requests Handler. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-27591 since 02/20/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 1.0.477, 1.1.12 or 1.2.12 eliminates this vulnerability. The upgrade is hosted for download at wintercms.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-11406). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Content Management System

Vendor

• Winter

Name

• CMS

Version

• 1.0.476
• 1.1.0
• 1.1.1
• 1.1.2
• 1.1.3
• 1.1.4
• 1.1.5
• 1.1.6
• 1.1.7
• 1.1.8
• 1.1.9
• 1.1.10
• 1.1.11
• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6
• 1.2.7
• 1.2.8
• 1.2.9
• 1.2.10
• 1.2.11

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

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• 🔒

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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