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CVE-2026-116688 is a vulnerability classified as Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), affecting ckeditor5 (affected versions: >= 45.0.0, < 47.7.4 and >= 48.0.0, < 48.5.1). This vulnerability is rated High, with a CVSS score of 8.1. Current sources do not report this vulnerability as exploited.
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CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. From 45.0.0 until 47.7.4 and 48.5.1, the engine uses a vulnerable es-toolkit version whose prototype-pollution behavior can be reached while CKEditor processes incoming style attribute values. Crafted editor content can thereby cause unauthorized JavaScript execution in the browser. This issue is fixed in versions 47.7.4 and 48.5.1.
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