{"id":"GHSA-rh54-vffm-5fvp","summary":"CKEditor: Cross-site scripting (XSS) in the engine package","details":"### 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.","aliases":["CVE-2026-116688"],"modified":"2026-10-27T21:15:04.796866053Z","published":"2026-10-27T21:05:06Z","database_specific":{"github_reviewed_at":"2026-10-27T21:05:06Z","nvd_published_at":null,"cwe_ids":["CWE-79"],"severity":"HIGH","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-rh54-vffm-5fvp"},{"type":"WEB","url":"https://github.com/ckeditor/ckeditor5/commit/4d9c5bb34f63cd956d15ccafbe584e14280c86a0"},{"type":"WEB","url":"https://github.com/ckeditor/ckeditor5/commit/a750e38635db6a18c5b11599c09f4fd702850423"},{"type":"PACKAGE","url":"https://github.com/ckeditor/ckeditor5"},{"type":"WEB","url":"https://github.com/ckeditor/ckeditor5/releases/tag/v47.7.4"},{"type":"WEB","url":"https://github.com/ckeditor/ckeditor5/releases/tag/v48.5.1"}],"affected":[{"package":{"name":"ckeditor5","ecosystem":"npm","purl":"pkg:npm/ckeditor5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"45.0.0"},{"fixed":"47.7.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rh54-vffm-5fvp/GHSA-rh54-vffm-5fvp.json"}},{"package":{"name":"@ckeditor/ckeditor5-engine","ecosystem":"npm","purl":"pkg:npm/%40ckeditor/ckeditor5-engine"},"ranges":[{"type":"SEMVER","events":[{"introduced":"45.0.0"},{"fixed":"47.7.4"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rh54-vffm-5fvp/GHSA-rh54-vffm-5fvp.json"}},{"package":{"name":"ckeditor5","ecosystem":"npm","purl":"pkg:npm/ckeditor5"},"ranges":[{"type":"SEMVER","events":[{"introduced":"48.0.0"},{"fixed":"48.5.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rh54-vffm-5fvp/GHSA-rh54-vffm-5fvp.json"}},{"package":{"name":"@ckeditor/ckeditor5-engine","ecosystem":"npm","purl":"pkg:npm/%40ckeditor/ckeditor5-engine"},"ranges":[{"type":"SEMVER","events":[{"introduced":"48.0.0"},{"fixed":"48.5.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-rh54-vffm-5fvp/GHSA-rh54-vffm-5fvp.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"}]}