CVE-2026-124422— SunEditor 3.0.0 before 3.4.0 Stored XSS via html.clean() Iframe Placeholder

Quick assessment

Affected

jihong88 suneditor

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SunEditor 3.0.0 至 3.4.0（不含 3.4.0）版本中，函数存在存储型跨站脚本（Stored XSS）漏洞。该函数在从 JSON 数据重建 iframe 时，未对属性或大写的键进行过滤。攻击者可通过粘贴操作、或方法注入特制的 HTML 内容，当受害者加载或粘贴该内容时，即可在目标页面上下文中执行恶意脚本。

CVSS 6.1 · Medium Updated Nov 08, 2026

Possible ATT&CK Techniques 2 AI

T1203 · Exploitation for Client Execution T1059 · Command and Scripting Interpreter

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Vulnerability Information

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Vulnerability Title

SunEditor 3.0.0 before 3.4.0 Stored XSS via html.clean() Iframe Placeholder

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

在Web页面生成时对输入的转义处理不恰当(跨站脚本)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
jihong88	suneditor	3.0.0 ~ 3.4.0	-

II. Public POCs for CVE-2026-124422

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-124422

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Other References for CVE-2026-124422 (5)

https://github.com/JiHong88/suneditor/commit/57db24ac218cd10942fed0bb8288e9cb40b334bb patch
https://github.com/JiHong88/suneditor/blob/3.3.3/src/core/logic/dom/html.js#L336-L350 technical-description
https://github.com/JiHong88/suneditor/releases/tag/3.4.0 release-notes
https://github.com/JiHong88/suneditor/security/advisories/GHSA-q867-q2hw-f8gp vendor-advisory
https://www.vulncheck.com/advisories/suneditor-3.0.0-before-3.4.0-stored-xss-via-html-clean-iframe-placeholder third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-124422

IV. Related Vulnerabilities

Same product: suneditor

Same vendor: jihong88

Same weakness: CWE-79