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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 CMS Winter是Winter CMS组织开源的一款内容管理系统。 Winter CMS Winter 1.2.13之前版本存在跨站脚本漏洞，该漏洞源于Brand Settings Styles字段提供的自定义CSS由LESS解析器编译并在所有后端页面未经清理地渲染，可能导致存储型跨站脚本攻击。

CVSS 8.1 · High EPSS 0.38% · P31

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
Vulnerability Title
Winter CMS Winter 跨站脚本漏洞
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之前版本存在跨站脚本漏洞，该漏洞源于Brand Settings Styles字段提供的自定义CSS由LESS解析器编译并在所有后端页面未经清理地渲染，可能导致存储型跨站脚本攻击。
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-2026-32257

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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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