{"id":"CVE-2021-26272","aliases":["GHSA-wpvm-wqr4-p7cw"],"url":"https://o3.security/vulnerability/CVE-2021-26272","summary":"Inclusion of Functionality from Untrusted Control Sphere in CKEditor 4","details":"It was possible to execute a ReDoS-type attack inside CKEditor 4 before 4.16 by persuading a victim to paste crafted URL-like text into the editor, and then press Enter or Space (in the Autolink plugin).","published":"2021-01-26T21:15:12.923Z","modified":"2026-07-08T05:56:56.955203153Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"ckeditor4","fixedVersion":"4.16.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://ckeditor.com/blog/CKEditor-4.16-with-improved-image-pasting-High-Contrast-support-and-a-new-color-API/#security-comes-first"},{"type":"ADVISORY","url":"https://github.com/ckeditor/ckeditor4/blob/major/CHANGES.md#ckeditor-416"},{"type":"ADVISORY","url":"https://www.oracle.com/security-alerts/cpujan2022.html"},{"type":"FIX","url":"https://www.oracle.com//security-alerts/cpujul2021.html"},{"type":"FIX","url":"https://www.oracle.com/security-alerts/cpuoct2021.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T05:56:56.955203153Z"}}