CVE-2026-116688
Published:October 27, 2026
Updated:October 28, 2026
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.
Affected Packages
@ckeditor/ckeditor5-engine (NPM):
Affected version(s) >=48.0.0-alpha.0 <48.5.1Fix Suggestion:
Update to version 48.5.1ckeditor5 (NPM):
Affected version(s) >=47.0.0-alpha.0 <47.7.4Fix Suggestion:
Update to version 47.7.4@ckeditor/ckeditor5-engine (NPM):
Affected version(s) >=47.0.0-alpha.0 <47.7.4Fix Suggestion:
Update to version 47.7.4ckeditor5 (NPM):
Affected version(s) >=48.0.0-alpha.0 <48.5.1Fix Suggestion:
Update to version 48.5.1Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.6
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation