CVE-2026-116688
CKEditor: Cross-site scripting (XSS) in the engine package
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | ckeditor |
| Product | ckeditor5 |
| Published | Oct 27, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
ckeditor / ckeditor5
>= 45.0.0, < 47.7.4 >= 48.0.0, < 48.5.1
References
github.com: https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-rh54-vffm-5fvp github.com: https://github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280c86a0 github.com: https://github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd702850423 github.com: https://github.com/ckeditor/ckeditor5/releases/tag/v47.7.4 github.com: https://github.com/ckeditor/ckeditor5/releases/tag/v48.5.1