Unauthenticated attackers are exploiting CVE-2026-94127 in F5 BIG-IP APM to run code on systems acting as OAuth authorization servers.
A Linux rootkit targeting devices in F5 BIG-IP APM environments can intercept PHP file loading and inject a fileless web shell directly into memory, avoiding the need to write malicious code to disk.
F5 has released security updates to address a critical BIG-IP APM zero-day vulnerability being exploited in remote code execution attacks.