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
EPSS: 0.002 (14.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 14.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
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)
- github.com/JiHong88/suneditor/releases/tag/3.4.0 (release-notes)
- github.com/JiHong88/suneditor/security/advisories/GHSA-q867-q2hw-f8gp (vendor-advisory)
- www.vulncheck.com/advisories/suneditor-3.0.0-before-3.4.0-stored-xss-via-html-c… (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.