wintercms Winter up to 1.2.12 Handler Dispatcher update_onDelete _handler permission

Summaryinfo

A vulnerability categorized as critical has been discovered in wintercms Winter up to 1.2.12. This affects the function update_onDelete of the component Handler Dispatcher. Executing a manipulation of the argument _handler can lead to permission. The identification of this vulnerability is CVE-2026-35445. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in wintercms Winter up to 1.2.12 and classified as critical. This vulnerability affects the function update_onDelete of the component Handler Dispatcher. The manipulation of the argument _handler with an unknown input leads to a permission vulnerability. The CWE definition for the vulnerability is CWE-275. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Winter CMS is a content management system built on the Laravel PHP framework. In versions prior to 1.2.13, the backend did not validate the handler name submitted through the form postback _handler POST field, allowing an authenticated backend user to invoke arbitrary controller methods, including protected, private, and action-prefixed ones. While AJAX requests validate that handler names match the on[A-Z][\w+]* pattern, the postback path passed the submitted _handler value straight to the handler dispatcher with no such check, so any controller that exposes a public action or conditionally relaxes its $requiredPermissions check could be reached, bypassing the roles and permissions system. The built-in Users controller was affected because it set $requiredPermissions to null for the myaccount action, letting any authenticated backend user invoke user-management methods such as update_onDelete and update_onManualPasswordReset without holding the backend.manage_users permission. This issue is fixed in version 1.2.13.

The advisory is available at github.com. This vulnerability was named CVE-2026-35445 since 04/02/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1222 by the MITRE ATT&CK project.

Upgrading to version 1.2.13 eliminates this vulnerability.

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

Productinfo

Vendor

• wintercms

Name

• Winter

Version

• 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
• 1.2.12

Website

• Product: https://github.com/wintercms/winter/

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

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