3.1 Low

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

CVE-2026-116687

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 [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.

Assessment

CVSS: 3.1 (v3.1)
Severity: Low
EPSS: 0.00252% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 27 October 2026
Last updated: 27 October 2026
Affected: ckeditor5, @ckeditor/ckeditor5-engine
Weakness: CWE-79

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

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