Postiz Has Unrestricted File Upload via MIME Type Spoofing that Leads to Stored XSS

Postiz is an AI social media scheduling tool. Prior to version 2.21.6, a file upload validation bypass allows any authenticated user to upload arbitrary HTML, SVG, or other executable file types to the server by spoofing the `Content-Type` header. The uploaded files are then served by nginx with a Content-Type derived from their original extension (`text/html`, `image/svg+xml`), enabling Stored Cross-Site Scripting (XSS) in the context of the application's origin. This can lead to session riding, account takeover, and full compromise of other users' accounts. Version 2.21.6 contains a fix.

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

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Gitroom Postiz 安全漏洞

Gitroom Postiz是Gitroom开源的一个社交媒体日程安排工具。 Gitroom Postiz 2.21.6之前版本存在安全漏洞，该漏洞源于文件上传验证绕过，可能导致存储型跨站脚本攻击、会话劫持和账户接管。

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