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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.\n\nThis vulnerability affects only installations where General HTML Support is enabled and configured to allow the affected HTML content.\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":"2026-10-27T21:05:13+00:00","modifiedAt":"2026-10-27T21:15:03.8231495+00:00","affected":[{"ecosystem":"npm","name":"ckeditor5","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"29.0.0"},{"kind":"fixed","version":"47.7.4"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"@ckeditor/ckeditor5-engine","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"29.0.0"},{"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:H/PR:L/UI:N/S:U/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-v6mg-96c6-gmpq","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-v6mg-96c6-gmpq","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-v6mg-96c6-gmpq","identifiers":["GHSA-v6mg-96c6-gmpq","CVE-2026-116687"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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