CKEditor: Cross-site scripting (XSS) in the engine package

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-116688
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-27 20:17:14 UTC
Updated2026-10-28 15:21:31 UTC
DescriptionCKEditor 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.

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.004970000 probability, percentile 0.425160000 (date 2026-10-28)

Problem Types: CWE-79 | CWE-79 CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ckeditor Ckeditor5 affected >= 45.0.0, < 47.7.4 Not specified
CNA Ckeditor Ckeditor5 affected >= 48.0.0, < 48.5.1 Not specified

References

ReferenceSourceLinkTags
github.com/ckeditor/ckeditor5/security/advisories/GHSA-rh54-vffm-5fvp [email protected] github.com
github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280... [email protected] github.com
github.com/ckeditor/ckeditor5/releases/tag/v47.7.4 [email protected] github.com
github.com/ckeditor/ckeditor5/releases/tag/v48.5.1 [email protected] github.com
github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd7028... [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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