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CISA Warns of Active Exploitation of Oracle WebLogic Vulnerability

Security Week · 25 Aug 2026

Key Takeaway If your business or IT provider uses Oracle WebLogic Server, apply available security updates immediately and confirm with vendors that patching has occurred.

The US Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning about a security flaw in Oracle WebLogic Server, tracked as CVE-2026-21962. According to CISA, threat actors are actively exploiting this vulnerability against organisations running affected WebLogic deployments.

Oracle WebLogic is a widely used application server platform, often deployed by businesses to run enterprise Java applications. Because it is internet-facing in many environments, vulnerabilities like this one can give attackers a foothold to access sensitive systems, deploy malware, or move further into a network.

While WebLogic is more commonly used by larger enterprises, Australian small businesses that rely on third-party IT providers, hosted applications, or managed platforms should check with their vendors to confirm whether any systems in their supply chain use Oracle WebLogic and whether patches have been applied.

Oracle WebLogic CISA vulnerability patch management enterprise software

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