XSS in Jihong88 Suneditor
CVE-2026-124422
SunEditor from 3.0.0 before 3.4.0 contains a stored cross-site scripting vulnerability in html.clean() that rebuilds iframes from data-se-iframe-holder-attrs JSON without filtering srcdoc or uppercase SRC keys. Attackers can inject crafted HTML through paste, html.set, or html.insert to execute script in the host page origin when victims load or paste the content.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/JiHong88/suneditor/blob/3.3.3/src/core/logic/dom/html.js (technical-description)
- github.com/JiHong88/suneditor/commit/57db24ac218cd10942fed0bb8288e9cb40b334bb (patch)
- suneditor 3.4.0 Release Notes (release-notes)
- GitHub Security Advisory (GHSA-q867-q2hw-f8gp) (vendor-advisory)
- VulnCheck Advisory: SunEditor 3.0.0 before 3.4.0 Stored XSS via html.clean() Iframe Placeholder (third-party-advisory)
Frequently asked questions
- What is CVE-2026-124422?
- CVE-2026-124422 is a medium-severity vulnerability in Jihong88 Suneditor, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-11-08.
- How severe is CVE-2026-124422?
- Medium severity. CVSS v3 base score is 6.1 out of 10.