faces/context/PartialViewContextImpl.java in Eclipse Mojarra, as used in Mojarra for Eclipse EE4J before 2.3.10 and Mojarra JavaServer Faces, allows Reflected XSS because a client window field is mishandled.
bugs.eclipse.org/bugs/show_bug.cgi?id=548244
github.com/eclipse-ee4j/mojarra/commit/8f70f2bd024f00ecd5b3dcca45df73edda29dcee
github.com/eclipse-ee4j/mojarra/commit/a3fa9573789ed5e867c43ea38374f4dbd5a8f81f
github.com/eclipse-ee4j/mojarra/compare/2.3.9-RELEASE...2.3.10-RELEASE
github.com/eclipse-ee4j/mojarra/files/3039198/advisory.txt
github.com/eclipse-ee4j/mojarra/issues/4556
github.com/eclipse-ee4j/mojarra/pull/4567
github.com/javaserverfaces/mojarra/compare/2.2.19...2.2.20
nvd.nist.gov/vuln/detail/CVE-2019-17091