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.
Published: 2026-11-08
Score: 9.3 Critical
EPSS: n/a
KEV: No
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Sun, 08 Nov 2026 13:30:00 +0000

Type Values Removed Values Added
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.
Title SunEditor before 3.4.0 Stored XSS via DocumentType Header textContent
Weaknesses CWE-79
References
Metrics cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-08T13:16:09.204Z

Reserved: 2026-11-08T02:21:16.290Z

Link: CVE-2026-124493

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-11-08T14:18:19.130

Modified: 2026-11-08T14:18:19.130

Link: CVE-2026-124493

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-08T14:45:15Z

Weaknesses
  • CWE-79

    Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')