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CVE-2026-59167— SunEditor: Critical XSS vulnerability - sanitizer bypass

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 是一个轻量级且功能强大的基于原生 JavaScript 的所见即所得（WYSIWYG）编辑器，无需任何外部依赖。在 2.47.11 版本之前，src/lib/core.js 中的 HTML 内容安全过滤机制未能始终如一地拒绝命名空间或非标准的 HTML 元素，导致攻击者可以构造包含事件处理程序属性（如 onclick、onerror 等）的恶意元素，这些属性在过滤后仍会被保留。 当应用程序渲染由攻击者控制的编辑器内容，且用户与该元素交互时，被保留的事件处理程序将在该应用程序的浏览器上下文中执行脚

CVSS 10.0 · Critical EPSS 0.50% · P43

Possible ATT&CK Techniques 1 AI

T1059.007 · JavaScript

Affected Version Matrix 1

VendorProduct Version RangeStatus
JiHong88 suneditor < 2.47.11 affected
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I. Basic Information for CVE-2026-59167

Vulnerability Information
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Vulnerability Title
SunEditor: Critical XSS vulnerability - sanitizer bypass
Source: CVE Program / CVE List V5
Vulnerability Description
SunEditor is a lightweight and powerful WYSIWYG editor in vanilla JavaScript with no dependencies. Prior to 2.47.11, the sanitizer in src/lib/core.js does not consistently reject namespaced or custom HTML elements, allowing event-handler attributes to remain on crafted elements. When an application renders attacker-controlled editor content and a user interacts with the element, the retained handler can execute script in the application's browser origin, enabling stored cross-site scripting, data exposure, or unauthorized browser-context actions. This issue is fixed in version 2.47.11.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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 < 2.47.11 -

II. Public POCs for CVE-2026-59167

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III. Intelligence Information for CVE-2026-59167

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Patches & Fixes for CVE-2026-59167 (1)

Other References for CVE-2026-59167 (3)

IV. Related Vulnerabilities

Same product: suneditor
Same vendor: JiHong88
Same weakness: CWE-79