Vulnerability · Published Aug 26, 2026 · Assigned by GitHub_M
CVE-2026-54606SunEditor: DOM XSS in SunEditor Embed Plugin via External Script Element After Iframe Embed
High 8.5
In plain English
A high-severity cross-site scripting in suneditor from JiHong88. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
SunEditor is a lightweight and powerful WYSIWYG editor in vanilla JavaScript with no dependencies. Prior to 3.1.4, the SunEditor Embed plugin in src/plugins/modal/embed.js parses attacker-controlled raw embed HTML with DOMParser and processes the resulting DOM nodes. When an external script element follows a valid iframe, the plugin recreates a script element from the attacker-controlled src attribute and appends it to the live DOM, causing JavaScript execution in the editor page. If an application stores or reflects SunEditor content without additional backend sanitization, an attacker who can submit embed HTML can trigger stored or reflected cross-site scripting when another user opens, previews, renders, or edits the content, enabling access to page data and account actions as the victim. This issue is fixed in version 3.1.4.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | suneditor | 3.1.4 | GHSA-w93q-cq9w-58p7 |
Affected products (as reported)
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
References
- https://github.com/JiHong88/suneditor/security/advisories/GHSA-w93q-cq9w-58p7 x_refsource_CONFIRM
- https://github.com/JiHong88/suneditor/issues/1649 x_refsource_MISC
- https://github.com/JiHong88/suneditor/commit/9d43a5e082101d2d6475cba86e0d58d7c2cf6677 x_refsource_MISC
- https://github.com/JiHong88/suneditor/releases/tag/3.1.4 x_refsource_MISC