{"id":"GHSA-rh54-vffm-5fvp","revision":"fcb280fa85c240a99fc7d737f6ddc7de","records":[{"revision":"fcb280fa85c240a99fc7d737f6ddc7de","observedAt":"2026-10-27T21:46:44.857+00:00","statement":{"source":"osv","id":"GHSA-rh54-vffm-5fvp","aliases":["CVE-2026-116688"],"title":"CKEditor: Cross-site scripting (XSS) in the engine package","description":"### Impact\nA 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.\n\nThe underlying issue has been patched by the library maintainers, and the fix has been incorporated into CKEditor 5.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version `48.5.1` (and above) and `47.7.4` (LTS).\n\n### For more information\nEmail us at [security@cksource.com](mailto:security@cksource.com) if you have any questions or comments about this advisory.","state":0,"publishedAt":"2026-10-27T21:05:06+00:00","modifiedAt":"2026-10-27T21:15:04.7968661+00:00","affected":[{"ecosystem":"npm","name":"ckeditor5","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"45.0.0"},{"kind":"fixed","version":"47.7.4"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@ckeditor/ckeditor5-engine","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"45.0.0"},{"kind":"fixed","version":"47.7.4"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"ckeditor5","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"48.0.0"},{"kind":"fixed","version":"48.5.1"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@ckeditor/ckeditor5-engine","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"48.0.0"},{"kind":"fixed","version":"48.5.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-rh54-vffm-5fvp","https://github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280c86a0","https://github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd702850423","https://github.com/ckeditor/ckeditor5","https://github.com/ckeditor/ckeditor5/releases/tag/v47.7.4","https://github.com/ckeditor/ckeditor5/releases/tag/v48.5.1"],"sourceUrl":"https://github.com/advisories/GHSA-rh54-vffm-5fvp","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-rh54-vffm-5fvp","identifiers":["GHSA-rh54-vffm-5fvp","CVE-2026-116688"]},"retained":false,"historicalAffected":[]}],"coverage":[]}