This page lists IBM WebSphere 8.5.5, 9.0, and 9.0.5.4 as supported; IBM has now released up to Fix pack 14 (9.0.5.14) IBM WebSphere vulnerabilities have been identified and a fix pack will be applied Is IBM WebSphere with Fix pack 14 supported?
Release : 9.1
IBM WebSphere Fix pack 14 (9.0.5.14) is a minor version upgrade from 9.0.5.4 and should be supported by Broadcom. Recommendation is that please test this in lower environment first and make sure it is working fine, if any issues found please reach out to Advanced Authentication support by opening a case.