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CVE-2023-28439— ckeditor4 plugins vulnerable to cross-site scripting caused by the editor instance destroying process

Quick assessment

Affected
ckeditor ckeditor4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CKEditor是一套开源的、基于网页的文字编辑器。 CKEditor4 4.21.0之前版本存在跨站脚本漏洞，该漏洞源于网页上的包缺少正确的内容安全策略配置。

CVSS 4.7 · Medium EPSS 0.73% · P53
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I. Basic Information for CVE-2023-28439

Vulnerability Information
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Vulnerability Title
ckeditor4 plugins vulnerable to cross-site scripting caused by the editor instance destroying process
Source: CVE Program / CVE List V5
Vulnerability Description
CKEditor4 is an open source what-you-see-is-what-you-get HTML editor. A cross-site scripting vulnerability has been discovered affecting Iframe Dialog and Media Embed packages. The vulnerability may trigger a JavaScript code after fulfilling special conditions: using one of the affected packages on a web page with missing proper Content Security Policy configuration; initializing the editor on an element and using an element other than `<textarea>` as a base; and destroying the editor instance. This vulnerability might affect a small percentage of integrators that depend on dynamic editor initialization/destroy mechanism. A fix is available in CKEditor4 version 4.21.0. In some rare cases, a security fix may be considered a breaking change. Starting from version 4.21.0, the Iframe Dialog plugin applies the `sandbox` attribute by default, which restricts JavaScript code execution in the iframe element. To change this behavior, configure the `config.iframe_attributes` option. Also starting from version 4.21.0, the Media Embed plugin regenerates the entire content of the embed widget by default. To change this behavior, configure the `config.embed_keepOriginalContent` option. Those who choose to enable either of the more permissive options or who cannot upgrade to a patched version should properly configure Content Security Policy to avoid any potential security issues that may arise from embedding iframe elements on their web page.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
CKEditor 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CKEditor是一套开源的、基于网页的文字编辑器。 CKEditor4 4.21.0之前版本存在跨站脚本漏洞，该漏洞源于网页上的包缺少正确的内容安全策略配置。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ckeditor ckeditor4 < 4.21.0 -

II. Public POCs for CVE-2023-28439

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III. Intelligence Information for CVE-2023-28439

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Vendor Advisories for CVE-2023-28439 (1)

Mailing List Discussions for CVE-2023-28439 (3)

Other References for CVE-2023-28439 (2)

IV. Related Vulnerabilities

Same product: ckeditor4
Same vendor: ckeditor
Same weakness: CWE-79

V. Comments for CVE-2023-28439

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