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Vulnerability record · CVE-2026-54606 · published 26 August 2026

CVE-2026-54606: Cross-site scripting vulnerability

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.

8.5 CVSS 4.0 High EPSS 0.58% · top 54.5% CWE-79 · Cross-site scripting Deferred
8.5CVSS 4.0 base score
0.58%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
9 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/JiHong88/suneditor/commit/9d43a5e082101d2d6475cba86e0d58d7c2cf6677
https://github.com/JiHong88/suneditor/issues/1649
https://github.com/JiHong88/suneditor/releases/tag/3.1.4
https://github.com/JiHong88/suneditor/security/advisories/GHSA-w93q-cq9w-58p7
https://github.com/JiHong88/suneditor/security/advisories/GHSA-w93q-cq9w-58p7

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Source: NIST National Vulnerability Database (record CVE-2026-54606), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.