A hacker named "rose87168" claims to have breached Oracle Cloud systems, exposing sensitive data from over 140,000 tenants, including encrypted passwords and other credentials. While Oracle denies the breach, cybersecurity firms have analyzed sample data provided by the hacker and found evidence suggesting the data is authentic. The breach may involve exploiting a vulnerability in Oracle Fusion Middleware, potentially impacting organizations globally. Security experts recommend affected parties take immediate measures, such as resetting credentials and enhancing access controls, to mitigate risks.