TinyMCE before 4.9.7 and 5.x before 5.1.4 allows XSS in the core parser, the paste plugin, and the visualchars plugin by using the clipboard or APIs to insert content into the editor.
Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-17480
Reference (s):
- https://github.com/tinymce/tinymce/security/advisories/GHSA-27gm-ghr9-4v95
- https://www.tiny.cloud/docs/release-notes/release-notes514/#securityfixes