IBM WebSphere Application Server - Liberty 22.0.0.11 through 26.0.0.5 IBM WebSphere Application Server Liberty could allow a remote attacker to bypass security under limited conditions by exploiting a specific timing window.
IBM strongly recommends addressing the vulnerability now by applying a currently available interim fix or fix pack that contains the fix for APAR PH70798. To determine if a feature is enabled for IBM WebSphere Application Server Liberty, refer to How to determine if Liberty is using a specific feature https://www.ibm.com/support/pages/node/6553910 .
For IBM WebSphere Application Server Liberty 22.0.0.11 - 26.0.0.5 using the appSecurity-3.0, appSecurity-4.0 or appSecurity-5.0 feature(s):
· Upgrade to minimal fix pack levels as required by the interim fix and then apply the Interim Fix that resolves PH70798 https://www.ibm.com/support/pages/node/7273239
--OR--
· Apply Liberty Fix Pack 26.0.0.6 or later (targeted availability 3Q2026).
Additional interim fixes may be available and linked off the interim fix download page.