{"id":"CVE-2021-32809","aliases":["GHSA-7889-rm5j-hpgg"],"url":"https://o3.security/vulnerability/CVE-2021-32809","summary":"Clipboard feature vulnerability allowing to inject arbitrary HTML into the editor using paste functionality","details":"### Affected packages\nThe vulnerability has been discovered in [clipboard](https://ckeditor.com/cke4/addon/clipboard) plugin. All plugins with [clipboard](https://ckeditor.com/cke4/addon/clipboard) plugin dependency are affected:\n\n* [clipboard](https://ckeditor.com/cke4/addon/clipboard)\n* [pastetext](https://ckeditor.com/cke4/addon/pastetext)\n* [pastetools](https://ckeditor.com/cke4/addon/pastetools)\n* [widget](https://ckeditor.com/cke4/addon/widget)\n* [uploadwidget](https://ckeditor.com/cke4/addon/uploadwidget)\n* [autolink](https://ckeditor.com/cke4/addon/autolink)\n* [tableselection](https://ckeditor.com/cke4/addon/tableselection)\n\n### Impact\nA potential vulnerability has been discovered in CKEditor 4 [Clipboard](https://ckeditor.com/cke4/addon/clipboard) package. The vulnerability allowed to abuse paste functionality using malformed HTML, which could result in injecting arbitrary HTML into the editor. It affects all users using the CKEditor 4 plugins listed above at version >= 4.5.2.\n\n### Patches\nThe problem has been recognized and patched. The fix will be available in version 4.16.2.\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 Anton Subbotin ([skavans](https://github.com/skavans)) for recognizing and reporting this vulnerability.\n","published":"2021-08-12T17:15:08.167Z","modified":"2026-07-08T06:29:29.485767936Z","cvss":{"score":5.4,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"ckeditor4","fixedVersion":"4.16.2"}],"fix":null,"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD/"},{"type":"ADVISORY","url":"https://github.com/ckeditor/ckeditor4/security/advisories/GHSA-7889-rm5j-hpgg"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-32809"},{"type":"PACKAGE","url":"https://github.com/ckeditor/ckeditor4"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NYA354LJP47KCVJMTUO77ZCX3ZK42G3T"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UVOYN2WKDPLKCNILIGEZM236ABQASLGW"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WAGNWHFIQAVCP537KFFS2A2GDG66J7XD"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T06:29:29.485767936Z"}}