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

高 8.1CVE-2026-116688 · GHSA-rh54-vffm-5fvp · 27/10/2026 公開 · 28/10/2026 更新

要点

CVE-2026-116688 は @ckeditor/ckeditor5-engine, ckeditor5 に影響する深刻度「高」 (CVSS 8.1) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.50%（全脆弱性の 42.7% より高い）。
対処：47.7.4, 48.5.1 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
@ckeditor/ckeditor5-engine npm	`≥ 45.0.0, < 47.7.4≥ 48.0.0, < 48.5.1`	`47.7.448.5.1`
ckeditor5 npm	`≥ 45.0.0, < 47.7.4≥ 48.0.0, < 48.5.1`	`47.7.448.5.1`

概要

Impact

A Cross-Site Scripting (XSS) vulnerability has been discovered in the CKEditor 5 engine. This vulnerability is caused by a prototype pollution issue in the es-toolkit library used in the CKEditor 5 codebase. This vulnerability could lead to unauthorized JavaScript code execution when the editor processes incoming style attribute values.

The underlying issue has been patched by the library maintainers, and the fix has been incorporated into CKEditor 5.

Patches

The problem has been recognized and patched. The fix will be available in version 48.5.1 (and above) and 47.7.4 (LTS).

For more information

Email us at [email protected] if you have any questions or comments about this advisory.

NVD の説明

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.