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F5 fixes exploited flaw in BIG-IP APM OAuth servers

F5 has released a security update after attackers exploited a serious bug in BIG-IP Access Policy Manager, allowing them to run code on affected systems without logging in. The vulnerability impacts only BIG-IP systems configured as OAuth authorization servers. The U.S. cybersecurity agency CISA added the flaw to its exploited vulnerabilities list and told federal agencies to apply F5's fix by September 25. F5 has not said which organizations were attacked or how many.

Why it mattersThe vulnerability allows remote code execution without authentication, putting organizations' application access controls at risk. Timely patching is required to prevent attacks on critical network infrastructure.

Sources covering this

SecurityWeekHeadline onlyCritical F5 BIG-IP Vulnerability Exploited as Zero-Day7:34 AMThe Hacker NewsF5 Patches Critical BIG-IP APM Zero-Day Exploited for Unauthenticated RCE on OAuth Servers8:29 AMRapid7PrimaryHeadline onlyCVE-2026-94127: Critical Unauthenticated RCE in F5 BIG-IP APM8:43 AM
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