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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 Winter是Winter CMS组织开源的一款内容管理系统。 Winter CMS Winter 1.2.13之前版本存在授权问题漏洞，该漏洞源于后端未验证通过表单postback的_handler字段提交的处理程序名称，可能导致经过身份验证的后端用户调用任意控制器方法，绕过角色和权限系统。

CVSS 7.1 · High EPSS 0.44% · P37

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
Vulnerability Title
Winter CMS Winter 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Winter CMS Winter是Winter CMS组织开源的一款内容管理系统。 Winter CMS Winter 1.2.13之前版本存在授权问题漏洞，该漏洞源于后端未验证通过表单postback的_handler字段提交的处理程序名称，可能导致经过身份验证的后端用户调用任意控制器方法，绕过角色和权限系统。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: postback handler validation bypassed - _handler=update_onManualPasswordReset was dispatched without validation (HTTP 500, error: )
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 8071 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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POC zip download
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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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