El Injection

How EL Injection happens in Java JSF applications and how to fix it

A high-severity Expression Language (EL) injection vulnerability was discovered and fixed in `PrimeFacesResourceProcessor.java`, a JSF phase listener responsible for resolving the PrimeFaces theme configuration. The flaw allowed a dynamically sourced theme parameter value to be passed directly into an EL expression factory without first verifying whether the value was actually an EL expression or plain text. The fix introduces explicit input branching that separates EL expressions from literal s