CVE-2021-41252— Cross-site scripting (XSS) from writer field content in the site frontend

Cross-site scripting (XSS) from writer field content in the site frontend

Kirby is an open source file structured CMS ### Impact Kirby's writer field stores its formatted content as HTML code. Unlike with other field types, it is not possible to escape HTML special characters against cross-site scripting (XSS) attacks, otherwise the formatting would be lost. If the user is logged in to the Panel, a harmful script can for example trigger requests to Kirby's API with the permissions of the victim. Because the writer field did not securely sanitize its contents on save, it was possible to inject malicious HTML code into the content file by sending it to Kirby's API directly without using the Panel. This malicious HTML code would then be displayed on the site frontend and executed in the browsers of site visitors and logged in users who are browsing the site. Attackers must be in your group of authenticated Panel users in order to exploit this weakness. Users who do not make use of the writer field are not affected. This issue has been patched in Kirby 3.5.8 by sanitizing all writer field contents on the backend whenever the content is modified via Kirby's API. Please update to this or a later version to fix the vulnerability.

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

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Kirby 跨站脚本漏洞

Kirby是一套基于文件的内容管理系统（CMS）。 Kirby 中存在跨站脚本漏洞，该漏洞源于产品未对输入数据做有效验证。攻击者可通过该漏洞执行客户端代码。以下产品及版本受到影响：Kirby 3.5.8 版本及之前版本。

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