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

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-23 · updated 2026-09-24
• Weakness: CWE-79

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.

Affected products

• JiHong88 suneditor: before 2.47.11

References

• https://github.com/JiHong88/suneditor/commit/a94ace269c7102bfb6de58a27a6547bc4eb09045
• https://github.com/JiHong88/suneditor/issues/1646
• https://github.com/JiHong88/suneditor/releases/tag/2.47.11
• https://github.com/JiHong88/suneditor/security/advisories/GHSA-6rf4-v2fh-m6p4
• https://github.com/JiHong88/suneditor/security/advisories/GHSA-6rf4-v2fh-m6p4

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