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  4. CVE 2026 124493 suneditor before 340 stored xss via documenttype
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Back to active CVEs
Critical · CVSS 9.3CVE-2026-124493

SunEditor before 3.4.0 Stored XSS via DocumentType Header textContentCVE-2026-124493

Answer in brief

CVE-2026-124493 records a Critical severity (CVSS 9.3) vulnerability in SunEditor before 3.4.0 Stored XSS via DocumentType Header textContent. The current sources do not mark it as known exploited. The current feed maps JiHong88/suneditor (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Nov 8, 2026Updated Nov 8, 2026Source checked Nov 8, 2026First seen by HOL Nov 8, 2026Material review Nov 8, 2026
Upstream Advisory

Key facts

Risk
Critical · CVSS 9.3
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 9.3. 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). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
JiHong88/suneditorgeneric>=0 <3.4.03.4.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for JiHong88/suneditor.
  2. 2Review the reported fix. Update JiHong88/suneditor to 3.4.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 8, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 8, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • Source referencevulncheck.com
Upstream source description

SunEditor before 3.4.0 contains a stored cross-site scripting vulnerability in the DocumentType constructor that injects header textContent into innerHTML without HTML escaping. Attackers can store entity-encoded HTML in h1-h6 headers that executes JavaScript when editors using document:header mode initialize, enabling session cookie theft.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • SunEditor before 3.4.0 Stored XSS via FileUpload Plugin FilenameSame jihong88/suneditor package
  • SunEditor before 3.4.0 Stored XSS via Link Modal Bookmark ListSame jihong88/suneditor package
  • SunEditor before 3.4.0 Stored XSS via &colon; Entity Sanitizer BypassSame jihong88/suneditor package
  • OpenEMR before 8.3.0 Stored XSS via CCDA/CCD Preview XSLT AttributesAlso CWE-79
  • OpenEMR before 8.3.0 Stored XSS via Eye Exam Document NotesAlso CWE-79
  • OpenEMR before 8.3.0 Stored XSS via CAMOS Rx Print ViewAlso CWE-79

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Nov 8, 2026
References
2 linked sources
Open source record