CVE-2026-22707— Strapi Upload Plugin MIME Validation Bypass via Content API

Strapi Upload Plugin MIME Validation Bypass via Content API

Strapi is an open source headless content management system. In Strapi versions prior to 5.33.3, the Upload plugin's Content API endpoints did not enforce the administrator-configured MIME type restrictions (`plugin.upload.security.allowedTypes` and `deniedTypes`). The same restrictions were correctly enforced on the Admin Panel upload path. The upload plugin's `enforceUploadSecurity` security check was invoked in the admin upload controller but was missing from the Content API controller. The Content API handlers `uploadFiles` and `replaceFile` (and the `upload` wrapper that dispatches to them) called the underlying upload service directly, bypassing both the magic-byte MIME detection and the configured allow/deny lists. An authenticated user with the Content API upload permission could therefore upload file types the administrator had explicitly disallowed, including HTML and SVG content. In deployments serving uploaded files from the same origin as the admin panel (default), an attacker could upload an HTML or SVG file that, when opened directly by an admin, executed JavaScript in the admin origin, enabling admin-session hijack and authenticated administrative actions against the admin API. The patch in version 5.33.3 introduces a shared `prepareUploadRequest` helper that wraps `enforceUploadSecurity` and is called from both the Content API and admin upload controllers, ensuring identical security policy enforcement on every upload entry point.

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危险类型文件的不加限制上传

Strapi 代码问题漏洞

Strapi是法国strapi社区的一套开源的内容管理系统（CMS）。 Strapi 5.33.3之前版本存在代码问题漏洞，该漏洞源于Upload插件的Content API端点未强制执行管理员配置的MIME类型限制，可能导致经过身份验证的用户上传管理员明确禁止的文件类型（如HTML和SVG内容），当管理员直接打开时执行JavaScript，实现管理员会话劫持。

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