CVE-2026-124493
JiHong88 suneditor
Published 8 Nov 2026 · updated 8 Nov 2026 · Received
9.3 Critical · CVSS 4.0, vulncheck.com
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.