SunEditor: DOM XSS in SunEditor Embed Plugin via External Script Element After Iframe Embed (CVE-2026-54606) | HOL Guard CVE

High severityCVE-2026-54606GHSA-W93Q-CQ9W-58P7

SunEditor: DOM XSS in SunEditor Embed Plugin via External Script Element After Iframe Embed

Answer in brief

CVE-2026-54606 records a High severity vulnerability in SunEditor: DOM XSS in SunEditor Embed Plugin via External Script Element After Iframe Embed. The current sources do not mark it as known exploited. The current feed maps JiHong88/suneditor (generic), suneditor (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 26, 2026Updated Aug 26, 2026Source checked Aug 26, 2026First seen by HOL Aug 26, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: High
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps JiHong88/suneditor (generic), suneditor (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
JiHong88/suneditorgeneric	< 3.1.4	Not reported
suneditornpm	<=3.1.3	3.1.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for JiHong88/suneditor, suneditor.
Review the reported fix. Update suneditor to 3.1.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 26, 2026

Sources and claim methodology

Upstream source description

SunEditor is a lightweight and powerful WYSIWYG editor in vanilla JavaScript with no dependencies. Prior to 3.1.4, the SunEditor Embed plugin in src/plugins/modal/embed.js parses attacker-controlled raw embed HTML with DOMParser and processes the resulting DOM nodes. When an external script element follows a valid iframe, the plugin recreates a script element from the attacker-controlled src attribute and appends it to the live DOM, causing JavaScript execution in the editor page. If an application stores or reflects SunEditor content without additional backend sanitization, an attacker who can submit embed HTML can trigger stored or reflected cross-site scripting when another user opens, previews, renders, or edits the content, enabling access to page data and account actions as the victim. This issue is fixed in version 3.1.4.

Quoted source text, attributed separately from HOL analysis.