USN-5340-2: CKEditor vulnerabilities

USN-5340-1 fixed several vulnerabilities in CKEditor. This update provides the fixes for CVE-2018-9861, CVE-2020-9281, CVE-2021-32809, CVE-2021-33829 and CVE-2021-37695 for Ubuntu 16.04 ESM. Original advisory details: Kyaw Min Thein discovered that CKEditor incorrectly handled certain inputs. An...