{"cve":"CVE-2025-25299","nvd":{"published":"2025-02-20T20:15:46.853","modified":"2026-06-17T09:00:38.570","status":"Deferred","description":"CKEditor 5 is a modern JavaScript rich-text editor with an MVC architecture. During a recent internal audit, a Cross-Site Scripting (XSS) vulnerability was discovered in the CKEditor 5 real-time collaboration package. This vulnerability affects user markers, which represent users' positions within the document. It can lead to unauthorized JavaScript code execution, which might happen with a very specific editor and token endpoint configuration. This vulnerability affects only installations with Real-time collaborative editing enabled. The problem has been recognized and patched. The fix is available in version 44.2.1 (and above). Users are advised to upgrade. There are no known workarounds for this vulnerability.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N","score":2.3},"cvss_v3":null,"cwes":["CWE-79","CWE-80"],"references":["https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html","https://github.com/ckeditor/ckeditor5/releases/tag/v44.2.1","https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-j3mm-wmfm-mwvh"],"products":[],"source":"nvd","synced_at":"2026-10-19T21:59:18.731010617+00:00"},"epss":{"cve":"CVE-2025-25299","score":0.00603,"percentile":0.4888,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-j3mm-wmfm-mwvh","url":"https://osv.dev/vulnerability/GHSA-j3mm-wmfm-mwvh","summary":"Cross-site scripting (XSS) in the CKEditor 5 real-time collaboration package","modified":"2025-02-20T22:53:45Z","packages":[{"ecosystem":"npm","name":"@ckeditor/ckeditor5-real-time-collaboration","purl":"pkg:npm/%40ckeditor/ckeditor5-real-time-collaboration","ranges":[">=41.3.0 <44.2.1"],"fixed":["44.2.1"]},{"ecosystem":"npm","name":"ckeditor5-premium-features","purl":"pkg:npm/ckeditor5-premium-features","ranges":[">=42.0.0 <44.2.1"],"fixed":["44.2.1"]}]}],"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."]}