{"id":"CVE-2020-5809","details":"A stored XSS vulnerability exists in Umbraco CMS \u003c= 8.9.1 or current. An authenticated user can inject arbitrary JavaScript code into iframes when editing content using the TinyMCE rich-text editor, as TinyMCE is configured to allow iframes by default in Umbraco CMS.","aliases":["GHSA-95qr-67rx-9pgh"],"modified":"2026-07-08T19:45:23.883058Z","published":"2020-12-30T16:15:12.320Z","references":[{"type":"EVIDENCE","url":"https://www.tenable.com/security/research/tra-2020-59"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/umbraco/umbraco-cms","events":[{"introduced":"0"},{"last_affected":"ca098e8a0190638712aefa807d6eb862f83aac4d"}],"database_specific":{"source":"CPE_RANGE","cpe":"cpe:2.3:a:umbraco:umbraco_cms:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"last_affected":"8.9.1"}]}}],"versions":["release-8.9.1","release-8.9.0","release-8.9.0-rc","release-8.1.0","release-7.2.0-beta2","release-7.2.0-beta","release-7.1.4","release-7.2.0-alpha","release-7.1.3","release-7.1.2","release-7.1.1","release-7.1.0","release-7.1.0-RC","release-7.0.0","release-7.0.0-RC","release-7.0.0-beta","release-6.1.0-beta","4.7.2","Release-4.6.0","Sprint-Juno-A","Release-4.5.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-5809.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:L/I:L/A:N"}]}