CVE-2026-116688: CKEditor: Cross-site scripting (XSS) in the engine package
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.
References
- github.com/advisories/GHSA-rh54-vffm-5fvp
- github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280c86a0
- github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd702850423
- github.com/ckeditor/ckeditor5/releases/tag/v47.7.4
- github.com/ckeditor/ckeditor5/releases/tag/v48.5.1
- github.com/ckeditor/ckeditor5/security/advisories/GHSA-rh54-vffm-5fvp
- nvd.nist.gov/vuln/detail/CVE-2026-116688
Code Behaviors & Features
Detect and mitigate CVE-2026-116688 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →