Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280
- https://github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd7028
- https://github.com/ckeditor/ckeditor5/releases/tag/v47.7.4
- https://github.com/ckeditor/ckeditor5/releases/tag/v48.5.1
- https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-rh54-vffm-5fvp
FAQ
What is CVE-2026-116688?
CVE-2026-116688 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-116688?
CVE-2026-116688 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-116688?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.