The host is installed with Atlassian Confluence Server before 6.13.23, 6.14.x before 7.4.11, 7.5.x before 7.11.6 or 7.12.x before 7.12.5 and is prone to an OGNL injection vulnerability. A flaw is present in the application which fails to properly handle unspecified vectors. Successful exploitation allows attackers to execute arbitrary code on a Confluence Server or Data Center instance.