Critical vulnerability in Oracle Hospitality OPERA 5 Property Services affecting multiple versions (5.6.19.24, 5.6.22, 5.6.25.19, 5.6.27.6, 5.6.28). The vulnerability allows unauthenticated attackers with network access via HTTP to completely compromise the system. Exploitation is easy and can result in full takeover of Oracle Hospitality OPERA 5 Property Services. CVSS 3.1 Base Score is 9.8 indicating critical severity with high impact on confidentiality, integrity, and availability. The vulnerability requires no authentication and no user interaction, making it particularly dangerous for hospitality industry systems.