{"cve":"CVE-2026-28343","nvd":{"published":"2026-03-05T20:16:16.017","modified":"2026-06-17T10:28:27.537","status":"Modified","description":"CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. Starting in version 29.0.0 and prior to version 47.6.0, a cross-site scripting (XSS) vulnerability has been discovered in the General HTML Support feature. This vulnerability could be triggered by inserting specially crafted markup, leading to unauthorized JavaScript code execution, if the editor instance used an unsafe General HTML Support configuration. This issue has been patched in version 47.6.0.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","score":6.1},"cwes":["CWE-79"],"references":["https://github.com/ckeditor/ckeditor5/releases/tag/v29.0.0","https://github.com/ckeditor/ckeditor5/releases/tag/v47.6.0","https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-jrqm-vmqc-gm93"],"products":["ckeditor:ckeditor5"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-28343","score":0.00319,"percentile":0.24887,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jrqm-vmqc-gm93","url":"https://osv.dev/vulnerability/GHSA-jrqm-vmqc-gm93","summary":"CKEditor 5 has Cross-site Scripting (XSS) in the HTML Support package","modified":"2026-03-19T19:01:33.116658Z","packages":[{"ecosystem":"npm","name":"@ckeditor/ckeditor5-html-support","purl":"pkg:npm/%40ckeditor/ckeditor5-html-support","ranges":[">=29.0.0 <47.6.0"],"fixed":["47.6.0"]},{"ecosystem":"npm","name":"ckeditor5","purl":"pkg:npm/ckeditor5","ranges":[">=29.0.0 <47.6.0"],"fixed":["47.6.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}