CVE-2021-32809— Arbitrary HTML injection vulnerability in ckeditor
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I. Basic Information for CVE-2021-32809
Vulnerability Information
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Vulnerability Title
Arbitrary HTML injection vulnerability in ckeditor
Source: NVD (National Vulnerability Database)
Vulnerability Description
ckeditor is an open source WYSIWYG HTML editor with rich content support. A potential vulnerability has been discovered in CKEditor 4 [Clipboard](https://ckeditor.com/cke4/addon/clipboard) package. The vulnerability allowed to abuse paste functionality using malformed HTML, which could result in injecting arbitrary HTML into the editor. It affects all users using the CKEditor 4 plugins listed above at version >= 4.5.2. The problem has been recognized and patched. The fix will be available in version 4.16.2.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: NVD (National Vulnerability Database)
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。 CKEditor 4 [Clipboard]包中存在跨站脚本漏洞，该漏洞允许用户使用格式错误的 HTML 滥用粘贴功能，这可能导致将任意 HTML 注入编辑器。
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
II. Public POCs for CVE-2021-32809
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://www.oracle.com/security-alerts/cpujan2022.htmlx_refsource_MISC
- https://www.oracle.com/security-alerts/cpuoct2021.htmlx_refsource_MISC
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2021-32809
Same Patch Batch · ckeditor · 2021-08-12 · 3 CVEs total
| CVE-2021-32808 | 7.6 HIGH | Cross-site scripting in ckeditor via abuse of undo functionality |
| CVE-2021-37695 | 7.3 HIGH | Execution of JavaScript code using malformed HTML in ckeditor |
IV. Related Vulnerabilities
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CKEditor4 Cross-site scripting (XSS) vulnerability caused by - CVE-2023-28439
ckeditor4 plugins vulnerable to cross-site scripting caused
Same vendor: ckeditor
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CKEditor is susceptible to Cross-Site Scripting (XSS) throug - CVE-2025-25299
Cross-site scripting (XSS) in the real-time collaboration pa - CVE-2024-45613
CKEditor 5 has Cross-site Scripting vulnerability in the cli - CVE-2024-43411
CKEditor4 has a low risk cross-site scripting (XSS) vulnerab
Same weakness: CWE-94
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V. Comments for CVE-2021-32809
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