It was found that the Apache Syncope EndUser UI login page prio to 2.0.15 and 2.1.6 reflects the successMessage parameters. By this mean, a user accessing the Enduser UI could execute javascript code from URL query string.

A malicious user with enough administration entitlements can inject html-like elements containing JavaScript statements into Connector names, Report names, AnyTypeClass keys and Policy descriptions. When another user with enough administration entitlements edits one of the Entities above via Admin Console, the injected JavaScript code is executed.

An administrator with user search entitlements in Apache Syncope 1.2.x before 1.2.11 and 2.0.x before 2.0.8 can recover sensitive security values using the fiql and orderby parameters.