CVE-2026-124422

EUVD-2026-119376
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.
Cross-site Scripting
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
6.1 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 14.87%
Common Weakness Enumeration
References
https://github.com/JiHong88/suneditor/blob/3.3.3/src/core/logic/dom/html.js#L336-L350
https://github.com/JiHong88/suneditor/commit/57db24ac218cd10942fed0bb8288e9cb40b334bb
https://github.com/JiHong88/suneditor/releases/tag/3.4.0
https://github.com/JiHong88/suneditor/security/advisories/GHSA-q867-q2hw-f8gp
https://www.vulncheck.com/advisories/suneditor-3.0.0-before-3.4.0-stored-xss-via-html-clean-iframe-placeholder