A flaw was found where some utility classes in Drools core did not use proper safeguards when deserializing data. This flaw allows an authenticated attacker to construct malicious serialized objects (usually called gadgets) and achieve code execution on the server.

Drools Workbench contains a path traversal vulnerability. The vulnerability allows a remote, authenticated attacker to bypass the directory restrictions and retrieve arbitrary files from the affected host.

JBoss Drools, Red Hat JBoss BRMS before 6.0.1, and Red Hat JBoss BPM Suite before 6.0.1 allows remote authenticated users to execute arbitrary Java code via a (1) MVFLEX Expression Language (MVEL) or (2) Drools expression.