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CVE-2025-25299— Cross-site scripting (XSS) in the real-time collaboration package

Quick assessment

Affected
ckeditor ckeditor5
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CKEditor开源的一个企业级 WYSIWYG 编辑器。 CKEditor 5版本存在安全漏洞，该漏洞源于实时协作包中发现了一个跨站脚本 (XSS) 漏洞，可能导致未经授权的JavaScript代码执行。

AI Predicted 5.4 Difficulty: Easy EPSS 0.60% · P46

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2025-25299

Vulnerability Information
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Vulnerability Title
Cross-site scripting (XSS) in the real-time collaboration package
Source: CVE Program / CVE List V5
Vulnerability Description
CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. During a recent internal audit, a Cross-Site Scripting (XSS) vulnerability was discovered in the CKEditor 5 real-time collaboration package. This vulnerability affects user markers, which represent users' positions within the document. It can lead to unauthorized JavaScript code execution, which might happen with a very specific editor and token endpoint configuration. This vulnerability affects only installations with Real-time collaborative editing enabled. The problem has been recognized and patched. The fix is available in version 44.2.1 (and above). Users are advised to upgrade. There are no known workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CKEditor是CKEditor开源的一个企业级 WYSIWYG 编辑器。 CKEditor 5版本存在安全漏洞，该漏洞源于实时协作包中发现了一个跨站脚本 (XSS) 漏洞，可能导致未经授权的JavaScript代码执行。
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 ckeditor5 @ckeditor/ckeditor5-real-time-collaboration: >= 41.3.0, < 44.2.1 -

II. Public POCs for CVE-2025-25299

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III. Intelligence Information for CVE-2025-25299

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Vendor Advisories for CVE-2025-25299 (1)

Vendor Pages for CVE-2025-25299 (2)

IV. Related Vulnerabilities

Same product: ckeditor5
Same vendor: ckeditor
Same weakness: CWE-79

V. Comments for CVE-2025-25299

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