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

低 3.1CVE-2026-116687 · GHSA-v6mg-96c6-gmpq · 27/10/2026 公開 · 28/10/2026 更新

要点

CVE-2026-116687 は @ckeditor/ckeditor5-engine, ckeditor5 に影響する深刻度「低」 (CVSS 3.1) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.25%（全脆弱性の 16.8% 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	`≥ 29.0.0, < 47.7.4≥ 48.0.0, < 48.5.1`	`47.7.448.5.1`
ckeditor5 npm	`≥ 29.0.0, < 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 could be triggered by inserting specially crafted markup under a specific General HTML Support configuration that allows inserting objects, leading to unauthorized JavaScript code execution in a browser context isolated from the origin of the application embedding the editor.

This vulnerability affects only installations where General HTML Support is enabled and configured to allow the affected HTML content.

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 29.0.0 until 47.7.4 and 48.5.1, specially crafted markup can trigger cross-site scripting when General HTML Support is enabled and specifically configured to allow object content. Processing that content can execute attacker-controlled JavaScript in a browser context isolated from the origin of the application embedding the editor. This issue is fixed in versions 47.7.4 and 48.5.1.