IBM QRadar SIEM 7.5.0 through 7.5.0 Update Package 14 could allow an attacker with access to one tenant to access hostname data from another tenant's account.
ProductVersionFixIBM QRadar SIEM 7.5.0 7.5.0 UP15 https://www.ibm.com/support/fixcentral/swg/selectFixes ( Release Notes https://www.ibm.com/support/pages/node/7257011 )