In CiviCRM before 5.21.3 and 5.22.x through 5.24.x before 5.24.3, users may be able to upload and execute a crafted PHAR archive.

PEAR HTML_QuickForm version 3.2.14 contains an eval injection (CWE-95) vulnerability in HTML_QuickForm's getSubmitValue method, HTML_QuickForm's validate method, HTML_QuickForm_hierselect's _setOptions method, HTML_QuickForm_element's _findValue method, HTML_QuickForm_element's _prepareValue method. that can result in Possible information disclosure, possible impact on data integrity and execution of arbitrary code. This attack appear to be exploitable via A specially crafted query string could be utilised, e.g. http://www.example.com/admin/add_practice_type_id[1]=fubar%27])%20OR%20die(%27OOK!%27);%20//&mode=live. This vulnerability appears to have been fixed in 3.2.15.