{"id":"CVE-2018-19420","aliases":["EUVD-2018-11112","GHSA-3h23-694f-8263"],"status":"published","title":"In GetSimpleCMS 3.3.15, admin/upload.php blocks .html uploads but there are several alternative...","description":"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.","severity":{"version":"3.0","score":3.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","level":"low","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00777,"percentile":0.5608,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-434"],"published":"2018-11-21T21:00:00Z","modified":"2026-10-20T10:50:23Z","products":[{"vendor":"get-simple","product":"getsimple_cms"}],"references":[{"url":"https://github.com/GetSimpleCMS/GetSimpleCMS/issues/1301","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","evidence"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2018-19420"},{"url":"https://github.com/advisories/GHSA-3h23-694f-8263"}],"sources":{"cve":[{"id":"CVE-2018-19420","description":"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.","status":"published","published":"2018-11-21T21:00:00Z","modified":"2024-09-16T17:28:02.673Z","updated_at":"2026-11-02T14:35:03.288698Z"}],"euvd":[{"id":"EUVD-2018-11112","description":"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.","status":"published","published":"2018-11-21T21:00:00Z","modified":"2024-09-16T17:28:02Z","updated_at":"2026-11-03T00:55:41.925187Z"}],"ghsa":[{"id":"GHSA-3h23-694f-8263","title":"In GetSimpleCMS 3.3.15, admin/upload.php blocks .html uploads but there are several alternative...","description":"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.","status":"published","published":"2022-05-14T01:44:59Z","modified":"2023-02-02T05:04:36Z","cvss":[{"version":"3.0","score":3.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","level":"low"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T14:51:54.899736Z"}],"nvd":[{"id":"CVE-2018-19420","description":"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.","status":"published","published":"2018-11-21T21:29:00.22Z","modified":"2026-06-17T01:49:16.68Z","cvss":[{"version":"3.0","score":3.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","level":"low","assessor":"primary"},{"version":"2.0","score":4,"vector":"AV:N/AC:L/Au:S/C:N/I:P/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-434"],"updated_at":"2026-11-02T14:04:48.987926Z"}],"osv":[{"id":"CVE-2018-19420","description":"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.","status":"published","published":"2018-11-21T21:29:00.22Z","modified":"2026-10-20T10:50:23.361920747Z","cvss":[{"version":"3.0","score":3.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:44:08.834469Z"}]}}