CVE-2026-54606: SunEditor DOM XSS Vulnerability via External Script Element After Iframe Embed
Summary
CVE-2026-54606: SunEditor Embed Plugin has DOM XSS via External Script Element After Iframe Embed. Affects suneditor versions < 3.1.4. Fixed in 3.1.4. How to fix ↓
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Background
SunEditor is a lightweight and customizable WYSIWYG text editor built for web applications. It allows users to create rich text content easily, supporting various features such as image uploads, video embeds, and more. However, a vulnerability in the Embed plugin allows for DOM-based Cross-Site Scripting (XSS), which can be exploited if user-generated content is not properly sanitized.
Vulnerability Detail
A DOM-based Cross-Site Scripting (XSS) vulnerability exists in the SunEditor Embed plugin. This vulnerability arises when crafted iframe embed HTML is followed by an external <script src=...> element, which bypasses the plugin's sanitization logic. The plugin appends the attacker-controlled script element to the live DOM, leading to JavaScript execution in the context of the editor page. If an application stores or reflects SunEditor content without additional backend sanitization, it can result in stored or reflected XSS when another user interacts with the malicious content. The vulnerability is particularly severe when content is stored in a backend and later rendered for users without proper sanitization.
How To Fix
Latest published version: 3.3.3 as of 22 Oct 2026
npm install suneditor@3.3.3Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
3.1.4
This is the first release that contains the fix.
npm install suneditor@3.1.4Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, modify the Embed plugin's code to prevent the recreation of script elements from user-controlled embed HTML. You can implement the following code snippet:
if (/^script$/i.test(chd.nodeName)) {
continue;
}
Conclusion
The SunEditor Embed plugin has a critical vulnerability that allows for DOM-based XSS through improperly handled user-generated content. It is essential to update to the latest version to mitigate this risk and ensure that all user inputs are properly sanitized to prevent exploitation.
See every vulnerability recorded for suneditor →
FAQ
The CVSS score of this vulnerability is 8.5, indicating a high severity level.
You can use Vulert to monitor and alert in real-time for open-source vulnerabilities in your software. Without requiring access to the code or installation, simply use your package-lock.json file.
An attacker can execute arbitrary JavaScript in another user's browser, potentially allowing account actions, modification of editor content, or access to sensitive data.
Yes, you can implement the provided workaround to prevent script elements from being appended to the DOM until you can update to the patched version.
You can find detailed information about this vulnerability in the advisory database or on the GitHub repository for SunEditor.
References
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