Vulnerability Details CVE-2018-19420
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 44.8%
CVSS Severity
CVSS v3 Score 3.8
CVSS v2 Score 4.0
References
Products affected by CVE-2018-19420
-
cpe:2.3:a:get-simple:getsimple_cms:3.3.15