Improper Restriction of XML External Entity Reference
XML external entity (XXE) vulnerability in Drools and jBPM before 6.2.0 CR4 allows remote attackers to read arbitrary files or possibly have other unspecified impact via a crafted BPMN2 file.
CWE-611 - Improper Restriction of XML External Entity Reference
Listed 4th in the 'OWASP Top Ten', XML External Entities (XXE) vulnerability allows attackers to provide an XML input that contains an external entity. When the XML is parsed, it can cause data extraction and manipulation, execution of commands, denial-of-service attacks, and server-side request forgery.