CVE-2026-59167
CRITICAL
CVSS 10.0
Published: 2026-09-23
Modified: 2026-09-24
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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.
Quick Facts
| CVE ID | CVE-2026-59167 |
| CVSS Score | 10.0 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| Published | 2026-09-23 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |