GlassFish

This brief details a behavioral detection strategy for identifying potential web shell deployment and persistence mechanisms by monitoring anomalous file creation activities originating from common web server processes on Linux.

This rule detects unusual child process executions originating from web server processes on Linux systems, which attackers may use to maintain persistence on a compromised system by exploiting web server vulnerabilities.

Identifies suspicious command executions via a web server on Linux systems, which may suggest a vulnerability and remote shell access.

A remote code execution vulnerability (CVE-2026-2587) exists in Eclipse GlassFish due to unsanitized user-supplied values in XML attributes being evaluated by the Java Expression Language (EL) engine, and a public exploit is now available.