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CVE-2026-63179— Winter: Local File Inclusion through @import directives in LESS compilation of backend customizable stylesheets and theme assets

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 是基于 Laravel PHP 框架构建的内容管理系统。在 1.2.12 及之前的版本中，经过身份验证的后端用户可通过在由后端编译的 LESS 源代码中注入 （内联）指令，泄露 PHP 进程可读的任意文件。这是因为 LESS 解析器在实例化时未配置安全的 import 解析器（safe import resolver），当没有匹配到允许的根目录时，会回退使用攻击者提供的原始路径。 该缺陷可通过四个共享相同根本原因的入口点触发： 1. 品牌设置（Brand Settings）中的 字段； 2.

CVSS 4.9 · Medium

Possible ATT&CK Techniques 1 AI

T1558.002 · Silver Ticket

Affected Version Matrix 1

VendorProduct Version RangeStatus
wintercms winter < 1.2.13 affected
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I. Basic Information for CVE-2026-63179

Vulnerability Information
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Vulnerability Title
Winter: Local File Inclusion through @import directives in LESS compilation of backend customizable stylesheets and theme assets
Source: CVE Program / CVE List V5
Vulnerability Description
Winter CMS is a content management system built on the Laravel PHP framework. In versions up to and including 1.2.12, authenticated backend users can disclose arbitrary files readable by the PHP process by injecting @import (inline) directives into LESS source that the backend compiles, because the LESS parser was instantiated without a safe import resolver and fell back to the raw attacker-supplied path when no allowed root matched. The flaw is reachable through four entry points that share the same root cause: the Brand Settings custom_css field, the Editor Settings html_custom_styles field, the Mail Brand Settings colour-picker fields whose values are concatenated into LESS source without escaping, and theme .less, .sass, and .scss assets compiled when served. Both absolute paths and .. traversal outside the asset's own tree were accepted, so an attacker could read any file the web process can access, most significantly the application .env file and the APP_KEY and database credentials it contains. Exploitation requires a backend account holding one of the associated permissions, which are assigned by default to the built-in Developer role. 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:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wintercms winter < 1.2.13 -

II. Public POCs for CVE-2026-63179

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III. Intelligence Information for CVE-2026-63179

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Patches & Fixes for CVE-2026-63179 (1)

Vendor Advisories for CVE-2026-63179 (1)

Vendor Pages for CVE-2026-63179 (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-2026-35445 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

IV. Related Vulnerabilities

Same product: winter
Same vendor: wintercms
Same weakness: CWE-22

V. Comments for CVE-2026-63179

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