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CVE-2026-32257— Winter: Stored XSS through Brand Settings custom styles

Quick assessment

Affected
wintercms winter
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Winter 是一个基于 Laravel PHP 框架的免费、开源的内容管理系统（CMS）。在 1.2.13 版本之前，具有 权限的后端用户通过“品牌设置”中的“样式”字段提供的自定义 CSS，会经过 LESS 解析器进行编译，并在每个后端页面渲染时未经过任何消毒处理（sanitization），从而导致针对后端用户的存储型跨站脚本（Stored XSS）漏洞。该问题已在 1.2.13 版本中修复。

CVSS 8.1 · High

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProduct Version RangeStatus
wintercms winter < 1.2.13 affected
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I. Basic Information for CVE-2026-32257

Vulnerability Information
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Vulnerability Title
Winter: Stored XSS through Brand Settings custom styles
Source: CVE Program / CVE List V5
Vulnerability Description
Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Prior to 1.2.13, custom CSS supplied through the Brand Settings Styles field by a backend user with the backend.manage_branding permission is compiled by the LESS parser and rendered without sanitization on every backend page, allowing stored cross-site scripting against backend users. This issue is fixed in version 1.2.13.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wintercms winter < 1.2.13 -

II. Public POCs for CVE-2026-32257

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III. Intelligence Information for CVE-2026-32257

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Patches & Fixes for CVE-2026-32257 (1)

Vendor Advisories for CVE-2026-32257 (1)

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

CVE-2026-32258 8.1 HIGH Winter: Stored XSS through Editor Settings custom styles
CVE-2026-35445 7.1 HIGH Winter: Authenticated backend users can bypass Users controller permission checks
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-79

V. Comments for CVE-2026-32257

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