{"id":"CVE-2018-19420","details":"In GetSimpleCMS 3.3.15, admin/upload.php blocks .html uploads but there are several alternative cases in which HTML can be executed, such as a file with no extension or an unrecognized extension (e.g., the test or test.asdf filename), because of admin/upload-uploadify.php, and validate_safe_file in admin/inc/security_functions.php.","modified":"2026-07-08T20:30:22.497305Z","published":"2018-11-21T21:29:00.220Z","references":[{"type":"EVIDENCE","url":"https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1301"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/getsimplecms/getsimplecms","events":[{"introduced":"a26202bee203910780f5a96b3bc1f52a8f23d0a1"},{"last_affected":"a26202bee203910780f5a96b3bc1f52a8f23d0a1"}],"database_specific":{"cpe":"cpe:2.3:a:get-simple:getsimple_cms:3.3.15:*:*:*:*:*:*:*","extracted_events":[{"introduced":"3.3.15"},{"last_affected":"3.3.15"}],"source":"CPE_STRING"}}],"versions":["3.3.15"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-19420.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N"}]}