{"id":"GHSA-pvmx-g8h5-cprj","summary":"Advanced Content Filter (ACF) vulnerability allowing to execute JavaScript code using malformed HTML","details":"### Affected packages\nThe vulnerability has been discovered in the Advanced Content Filter (ACF) module and may affect all plugins used by CKEditor 4.\n\n### Impact\nA potential vulnerability has been discovered in CKEditor 4 Advanced Content Filter (ACF) core module. The vulnerability allowed to inject malformed HTML bypassing content sanitization, which could result in executing JavaScript code. It affects all users using the CKEditor 4 at version \u003c 4.17.0.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 4.17.0.\n\n### For more information\nEmail us at security@cksource.com if you have any questions or comments about this advisory.\n\n### Acknowledgements\nThe CKEditor 4 team would like to thank Maurice Dauer ([laytonctf](https://twitter.com/laytonctf)) for recognizing and reporting this vulnerability.\n","aliases":["BIT-drupal-2021-41164","CVE-2021-41164"],"modified":"2026-07-08T06:28:08.168219118Z","published":"2021-11-17T21:55:10Z","database_specific":{"nvd_published_at":"2021-11-17T19:15:00Z","severity":"HIGH","cwe_ids":["CWE-79"],"github_reviewed_at":"2021-11-17T19:56:22Z","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-pvmx-g8h5-cprj"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41164"},{"type":"PACKAGE","url":"https://github.com/ckeditor/ckeditor4"},{"type":"WEB","url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-417"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VR76VBN5GW5QUBJFHVXRX36UZ6YTCMW6"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WOZGMCYDB2OKKULFXZKM6V7JJW4ZZHJP"},{"type":"WEB","url":"https://www.drupal.org/sa-core-2021-011"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpuapr2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"WEB","url":"https://www.oracle.com/security-alerts/cpujul2022.html"}],"affected":[{"package":{"name":"ckeditor4","ecosystem":"npm","purl":"pkg:npm/ckeditor4"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.17.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/11/GHSA-pvmx-g8h5-cprj/GHSA-pvmx-g8h5-cprj.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:L"}]}