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CKSource CKEditor 5CKEditor: Cross-site scripting (XSS) in the engine package

Risk 60

Severity

8.1

XSS

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

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 security@cksource.com if you have any questions or comments about this advisory.

1 / 3

Source: GitHub

First published (updated )

CVE-2026-116688

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CKSource CKEditor 5CKEditor: Cross-site scripting (XSS) in the engine package

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