Cross-Site Scripting (XSS) via postMessage Handler in Squidex

Squidex is an open source headless CMS and content management hub. Affected versions are missing origin verification in a postMessage handler which introduces a Cross-Site Scripting (XSS) vulnerability. The editor-sdk.js file defines three different class-like functions, which employ a global message event listener: SquidexSidebar, SquidexWidget, and SquidexFormField. The registered event listener takes some action based on the type of the received message. For example, when the SquidexFormField receives a message with the type valueChanged, the value property is updated. The SquidexFormField class is for example used in the editor-editorjs.html file, which can be accessed via the public wwwroot folder. It uses the onValueChanged method to register a callback function, which passes the value provided from the message event to the editor.render. Passing an attacker-controlled value to this function introduces a Cross-Site Scripting (XSS) vulnerability.

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

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Squidex 跨站脚本漏洞

squidex是一款 Headless CMS 和内容管理中心。 Squidex 7.8.2版本存在跨站脚本漏洞，该漏洞源于postMessage处理程序缺少原始验证，导致存在跨站脚本（XSS）漏洞。

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