CVE-2026-59167
SunEditor: Critical XSS vulnerability - sanitizer bypass
CRITICAL 10.0EPSS 0.4%
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.
- Affected
- JiHong88 · suneditor
- CVSS v3.1 GITHUB
- 10.0 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - EPSS
- 0.39% chance of exploitation in the next 30 days, 32nd percentile
- Published
- 2026-09-23
- Updated
- 2026-09-24