What is GHSA-pxmj-79fq-gv83?

GHSA-pxmj-79fq-gv83 is a security advisory published by GitHub Security Advisories with Critical severity. SunEditor before 3.4.0 contains a stored cross-site scripting vulnerability in the DocumentType...

Which CVE IDs does GHSA-pxmj-79fq-gv83 cover?

GHSA-pxmj-79fq-gv83 covers the following CVE IDs: CVE-2026-124493. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

GHSA-pxmj-79fq-gv83Critical

SunEditor before 3.4.0 contains a stored cross-site scripting vulnerability in the DocumentType...

Vendor

GitHub Security Advisories

Published

November 8, 2026

Last Modified

November 8, 2026

🔗 CVE IDs covered (1)

CVE-2026-124493 →

📋 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.

🔗 References (4)

https://github.com/JiHong88/suneditor/security/advisories/GHSA-h9pq-57qf-vvfh
https://nvd.nist.gov/vuln/detail/CVE-2026-124493
https://www.vulncheck.com/advisories/suneditor-before-3.4.0-stored-xss-via-documenttype-header-textcontent
https://github.com/advisories/GHSA-pxmj-79fq-gv83