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CVE-2026-35445— Winter: Authenticated backend users can bypass Users controller permission checks

Quick assessment

Affected
wintercms winter
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Winter CMS 是一个基于 Laravel PHP 框架构建的内容管理系统。在 1.2.13 版本之前的版本中，后台未对通过表单回传（postback） POST 字段提交的处理器（handler）名称进行校验，导致经过身份验证的后台用户能够调用任意的控制器方法，包括受保护的（protected）、私有的（private）以及以“action”为前缀的方法。虽然 AJAX 请求会校验处理器名称是否符合 格式，但通过 postback 路径时，系统将提交的 值直接传递给处理器调度器，而未进行类似的检查。因此，任

CVSS 7.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
wintercms winter < 1.2.13 affected
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I. Basic Information for CVE-2026-35445

Vulnerability Information
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Vulnerability Title
Winter: Authenticated backend users can bypass Users controller permission checks
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wintercms winter < 1.2.13 -

II. Public POCs for CVE-2026-35445

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 8071 chars
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III. Intelligence Information for CVE-2026-35445

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Patches & Fixes for CVE-2026-35445 (1)

Vendor Advisories for CVE-2026-35445 (1)

Vendor Pages for CVE-2026-35445 (1)

Same Patch Batch · wintercms · 2026-08-26 · 7 CVEs total

CVE-2026-32257 8.1 HIGH Winter: Stored XSS through Brand Settings custom styles
CVE-2026-32258 8.1 HIGH Winter: Stored XSS through Editor Settings custom styles
CVE-2026-32639 6.8 MEDIUM Winter: Broken access control in `Cms\Controllers\Index` allows cross-template actions and
CVE-2026-32593 5.9 MEDIUM Winter: SQL Injection in Backend Filter Widget numberrange Scope via numbersFromAjax
CVE-2026-54256 5.4 MEDIUM Winter: Authenticated IDOR in backend FileUpload widget allows cross-user access to attach
CVE-2026-63179 4.9 MEDIUM Winter: Local File Inclusion through @import directives in LESS compilation of backend cus

IV. Related Vulnerabilities

Same product: winter
Same vendor: wintercms
Same weakness: CWE-285

V. Comments for CVE-2026-35445

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