Is CVE-2026-116688 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-116688?

CVE-2026-116688 has a CVSS v3 severity of HIGH (8.1).

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CVE-2026-116688

Description

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.