{"id":"CVE-2025-25299","aliases":["EUVD-2025-4561","GHSA-j3mm-wmfm-mwvh","UBUNTU-CVE-2025-25299"],"status":"published","title":"Cross-site scripting (XSS) in the real-time collaboration package","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.","severity":{"version":"4.0","score":2.3,"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","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00603,"percentile":0.4921,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-79","CWE-80"],"published":"2025-02-20T19:23:03Z","modified":"2026-10-28T02:30:54Z","fixes":[{"ecosystem":"npm","package":"@ckeditor/ckeditor5-real-time-collaboration","fixed_in":["44.2.1"],"sources":["ghsa","osv"]},{"ecosystem":"npm","package":"ckeditor5-premium-features","fixed_in":["44.2.0","44.2.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"npm","package":"@ckeditor/ckeditor5-real-time-collaboration","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"41.3.0"},{"last_affected":"44.2.0"},{"fixed":"44.2.1"}]}]},{"source":"ghsa","ecosystem":"npm","package":"ckeditor5-premium-features","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"42.0.0"},{"fixed":"44.2.0"}]}]},{"source":"osv","ecosystem":"npm","package":"@ckeditor/ckeditor5-real-time-collaboration","ranges":[{"type":"SEMVER","events":[{"introduced":"41.3.0"},{"fixed":"44.2.1"}]}]},{"source":"osv","ecosystem":"npm","package":"ckeditor5-premium-features","ranges":[{"type":"SEMVER","events":[{"introduced":"42.0.0"},{"fixed":"44.2.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"ckeditor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.4+dfsg1-3","4.5.6+dfsg-1","4.5.7+dfsg-1","4.5.7+dfsg-2","4.5.7+dfsg-2ubuntu0.16.04.1~esm1","4.5.7+dfsg-2ubuntu0.16.04.1~esm2","4.5.7+dfsg-2ubuntu0.16.04.1~esm3"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"ldap-account-manager","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.9-1","5.1-1","5.2-1","5.2-1ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"request-tracker4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.11-2","4.2.12-3","4.2.12-4","4.2.12-5"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"ckeditor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.5.7+dfsg-2","4.5.7+dfsg-2ubuntu0.18.04.1","4.5.7+dfsg-2ubuntu0.18.04.1+esm1","4.5.7+dfsg-2ubuntu0.18.04.1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"ckeditor3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.6.1+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"ldap-account-manager","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.7-1","6.1-1","6.2-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"request-tracker4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.1-5","4.4.2-1","4.4.2-2","4.4.2-2ubuntu0.1~esm1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"ckeditor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.1+dfsg-1","4.12.1+dfsg-1","4.12.1+dfsg-1ubuntu0.1","4.12.1+dfsg-1ubuntu0.1+esm1","4.12.1+dfsg-1ubuntu0.1+esm2"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"ckeditor3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.6.1+dfsg-3","3.6.6.1+dfsg-4"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"ldap-account-manager","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["6.7-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"request-tracker4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.3-2","4.4.3-2+deb10u3build0.20.04.1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"ckeditor3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.6.1+dfsg-7"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"ldap-account-manager","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["7.5-1","7.7-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"request-tracker4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.4+dfsg-2ubuntu1","4.4.4+dfsg-2ubuntu1.22.04.1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:22.04:LTS","package":"ckeditor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.16.0+dfsg-2","4.16.2+dfsg-1","4.16.2+dfsg-1ubuntu0.1~esm1","4.16.2+dfsg-1ubuntu0.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"ckeditor3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.6.1+dfsg-7"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"ldap-account-manager","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["8.3-1","8.5-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"request-tracker4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.4+dfsg-2ubuntu1","4.4.4+dfsg-2ubuntu2","4.4.7+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:24.04:LTS","package":"ckeditor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.22.1+dfsg1-2","4.22.1+dfsg1-2ubuntu0.24.04.1~esm1","4.22.1+dfsg1-2ubuntu0.24.04.1~esm2"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"ckeditor","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.22.1+dfsg1-2ubuntu1","4.22.1+dfsg1-2ubuntu1.1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"ldap-account-manager","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.0-1"]},{"source":"osv","ecosystem":"Ubuntu:25.10","package":"request-tracker4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.7+dfsg-4syncable1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"ldap-account-manager","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.0-1","9.0-1build1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"request-tracker4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.4.7+dfsg-4syncable1"]}],"products":[{"vendor":"ckeditor","product":"ckeditor5"}],"references":[{"url":"https://github.com/ckeditor/ckeditor5/security/advisories/GHSA-j3mm-wmfm-mwvh","tags":["x_refsource_CONFIRM","advisory","web","report"]},{"url":"https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/ckeditor/ckeditor5/releases/tag/v44.2.1","tags":["x_refsource_MISC","web"]},{"url":"https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html?docId=ee1dca024c9b4e44aef039f99ebe6c664","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-25299","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-j3mm-wmfm-mwvh"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/25xxx/CVE-2025-25299.json","tags":["advisory"]},{"url":"https://github.com/ckeditor/ckeditor5","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2025-25299","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-25299","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-25299","title":"Cross-site scripting (XSS) in the real-time collaboration package","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.","status":"published","published":"2025-02-20T19:23:03.013Z","modified":"2025-02-20T19:47:33.534Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low","assessor":"cna"}],"cwes":["CWE-79","CWE-80"],"updated_at":"2026-11-02T14:32:32.30152Z"}],"euvd":[{"id":"EUVD-2025-4561","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.","status":"published","published":"2025-02-20T19:23:03Z","modified":"2025-02-20T19:47:33Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"}],"updated_at":"2026-11-02T20:53:26.353093Z"}],"ghsa":[{"id":"GHSA-j3mm-wmfm-mwvh","title":"Cross-site scripting (XSS) in the CKEditor 5 real-time collaboration package","description":"### Impact\nDuring a recent internal audit, we identified a Cross-Site Scripting (XSS) vulnerability in the CKEditor 5 real-time collaboration package. This vulnerability can lead to unauthorized JavaScript code execution and affects user markers, which represent users' positions within the document.\n\nThis vulnerability affects only installations with [Real-time collaborative editing](https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html) enabled.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 44.2.1 (and above).\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.","status":"published","published":"2025-02-20T20:16:31Z","modified":"2025-02-20T22:53:47Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"cwes":["CWE-79","CWE-80"],"updated_at":"2026-11-02T14:38:32.275316Z"}],"nvd":[{"id":"CVE-2025-25299","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.","status":"published","published":"2025-02-20T20:15:46.853Z","modified":"2026-06-17T09:00:38.57Z","cvss":[{"version":"4.0","score":2.3,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"}],"cwes":["CWE-79","CWE-80"],"updated_at":"2026-11-02T14:10:51.871789Z"}],"osv":[{"id":"CVE-2025-25299","title":"Cross-site scripting (XSS) in the real-time collaboration package","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.","status":"published","published":"2025-02-20T19:23:03.013Z","modified":"2026-10-28T02:30:54.654401645Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"}],"cwes":["CWE-79","CWE-80"],"updated_at":"2026-11-02T15:44:47.386092Z"},{"id":"GHSA-j3mm-wmfm-mwvh","title":"Cross-site scripting (XSS) in the CKEditor 5 real-time collaboration package","description":"### Impact\nDuring a recent internal audit, we identified a Cross-Site Scripting (XSS) vulnerability in the CKEditor 5 real-time collaboration package. This vulnerability can lead to unauthorized JavaScript code execution and affects user markers, which represent users' positions within the document.\n\nThis vulnerability affects only installations with [Real-time collaborative editing](https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/real-time-collaboration/real-time-collaboration.html) enabled.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 44.2.1 (and above).\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.","status":"published","published":"2025-02-20T20:16:31Z","modified":"2025-02-20T22:53:45Z","cvss":[{"version":"4.0","score":6.9,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","level":"medium"}],"cwes":["CWE-79","CWE-80"],"updated_at":"2026-11-02T15:46:49.977351Z"},{"id":"UBUNTU-CVE-2025-25299","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.","status":"published","published":"2025-02-20T20:15:00Z","modified":"2026-05-20T16:20:59.47662085Z","cvss":[{"version":"4.0","score":2.3,"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","level":"low"}],"updated_at":"2026-11-02T16:55:26.330196Z"}]}}