Some security vulnerabilities in v3.3.15 SECURITY
#1310 by LoRexxar was closed on May 24, 2019 3.3.16

Arbitrary File Delete - Security PRIORITY SECURITY
#1303 by jadacheng was closed on Mar 5, 2019 3.3.16

GetSimpleCMS allowed to some files that are able to execute HTML Bug SECURITY
#1301 by Hexife was closed on May 24, 2019 3.3.16

Advisory from Netsparker - GetSimpleCMS - Open Redirection Bug SECURITY
#1300 by DanielBishtawi was closed on May 22, 2019 3.3.16

Insert Stored XSS in setting.php SECURITY
#1298 by 1130479816 was closed on May 24, 2019 3.3.16

Stored XSS in GetSimple CMS Duplicate SECURITY
#1297 by security-breachlock was closed on May 24, 2019 3.3.16

Cross Site Scripting Vulnerability in GetSimple CMS v-3.3.13 Bug SECURITY
#1293 by riteshgupta1993 was closed on May 23, 2019 3.3.16

debug_backtrace() was changed in PHP 7 Bug in progress
#1238 opened on Oct 30, 2017 by bigin 3.3.16