An issue was discovered in the Asset Pipeline plugin before 3.0.4 for Grails. An attacker can perform directory traversal via a crafted request when a servlet-based application is executed in Jetty, because there is a classloader vulnerability that can allow a reverse file traversal route in AssetPipelineFilter.groovy or AssetPipelineFilterCore.groovy.

Asset Pipeline Grails Plugin Asset-pipeline plugin version Prior to 2.14.1.1, 2.15.1 and 3.0.6 contains a Incorrect Access Control vulnerability in Applications deployed in Jetty that can result in Download .class files and any arbitrary file. This attack appear to be exploitable via Specially crafted GET request containing directory traversal from assets-pipeline context. This vulnerability appears to have been fixed in 2.14.1.1 (for Grails 2.x), 2.15.1 (for Grails 3 and Java 7) and 3.0.6 (for Grails 3 and Java 8).