Summary
SunEditor Embed Plugin has DOM XSS via External Script Element After Iframe Embed
A DOM-based Cross-Site Scripting (XSS) vulnerability exists in the SunEditor Embed plugin. Crafted iframe embed HTML followed by an external
Impact
An attacker who can provide or store embed HTML can execute arbitrary JavaScript in another user’s browser when the content is processed by SunEditor. This may allow account actions as the victim, modification of editor content, or access to sensitive data available in the editor page.
The issue is especially impactful when SunEditor content is stored in a backend and later reopened or rendered for administrators, editors, or other users without additional sanitization.
Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Do not recreate or append script elements from user-controlled embed HTML.
Minimum mitigation:
if (/^script$/i.test(chd.nodeName)) {
continue;
}
A stronger fix is to allow only expected embed elements such as iframe or blockquote, sanitize their attributes, and discard all other sibling elements.
Frequently Asked Questions
- What is CVE-2026-54606? CVE-2026-54606 is a high-severity cross-site scripting (XSS) vulnerability in suneditor (npm), affecting versions <= 3.1.3. It is fixed in 3.1.4. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
- Which versions of suneditor are affected by CVE-2026-54606? suneditor (npm) versions <= 3.1.3 is affected.
- Is there a fix for CVE-2026-54606? Yes. CVE-2026-54606 is fixed in 3.1.4. Upgrade to this version or later.
- Is CVE-2026-54606 exploitable, and should I be worried? Whether CVE-2026-54606 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-54606 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-54606? Upgrade
suneditorto 3.1.4 or later.