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CVE-2026-54606: CVE-2026-54606: DOM-based Cross-Site Scripting via Programmatic Script Recreation in SunEditor Embed Plugin

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CVE-2026-54606: DOM-based Cross-Site Scripting via Programmatic Script Recreation in SunEditor Embed Plugin

Vulnerability ID: CVE-2026-54606
CVSS Score: 8.5
Published: 2026-08-26

A DOM-based Cross-Site Scripting (XSS) vulnerability was identified in SunEditor before version 3.1.4. The Embed plugin programmatically recreated and mounted script elements from raw HTML embed code, permitting remote attackers to execute arbitrary JavaScript within a user's browser session.

TL;DR

SunEditor versions prior to 3.1.4 are vulnerable to DOM-based XSS because the Embed plugin unsafely parses raw iframe/blockquote blocks and programmatically re-creates sibling script elements, causing immediate execution of attacker-controlled JavaScript.

⚠️ Exploit Status: POC

Technical Details

  • CWE ID: CWE-79 (DOM-based Cross-Site Scripting)
  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: Passive
  • CVSS v4.0 Score: 8.5 (High)
  • Exploit Status: Proof-of-Concept Available
  • CISA KEV Status: Not Listed

Affected Systems

  • Web applications using SunEditor with the Embed plugin activated
  • suneditor: < 3.1.4 (Fixed in: 3.1.4)

Code Analysis

Commit: 9d43a5e

Fix DOM-XSS vulnerability in the Embed plugin by validating iframe content types, enforcing a script source whitelist, and dropping unapproved or inline scripts.

Exploit Details

Mitigation Strategies

  • Upgrade SunEditor to version 3.1.4 or above to enforce script block validation
  • Configure strict regular expressions with anchor markers for scriptSrcWhitelist if external scripts are required
  • Implement client-side Content Security Policies (CSP) to restrict external script execution locations
  • Deploy Web Application Firewall (WAF) filtering to identify and block script element injections within embed fields

Remediation Steps:

  1. Identify all projects and node modules containing dependencies on the suneditor npm package
  2. Update the package package.json file to refer to suneditor version 3.1.4 or later
  3. Execute npm install or yarn install to pull down the validated fixed package
  4. Review SunEditor initialization blocks and define whitelists using the scriptSrcWhitelist configuration setting
  5. Deploy changes to production environments and verify script blocking behavior within the editor UI

References

Read the full report for CVE-2026-54606 on our website for more details including interactive diagrams and full exploit analysis.

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