Winter CMS vulnerable to stored XSS through privileged upload of SVG file

Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Users with the `backend.manage_branding` permission can upload SVGs as the application logo. Prior to version 1.2.3, SVG uploads were not sanitized, which could have allowed a stored cross-site scripting (XSS) attack. To exploit the vulnerability, an attacker would already need to have developer or super user level permissions in Winter CMS. This means they would already have extensive access and control within the system. Additionally, to execute the XSS, the attacker would need to convince the victim to directly visit the URL of the maliciously uploaded SVG, and the application would have to be using local storage where uploaded files are served under the same domain as the application itself instead of a CDN. This is because all SVGs in Winter CMS are rendered through an `img` tag, which prevents any payloads from being executed directly. These two factors significantly limit the potential harm of this vulnerability. This issue has been patched in v1.2.3 through the inclusion of full support for SVG uploads and automatic sanitization of uploaded SVG files. As a workaround, one may apply the patches manually.

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Winter 跨站脚本漏洞

Winter是基于 Laravel PHP 框架的免费、开源、自托管 CMS 平台。 Winter 1.2.3 版本之前存在跨站脚本漏洞，该漏洞源于 SVG 上传未经过清理，这可能会导致存储型跨站脚本 (XSS) 攻击。

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