Eclipse Foundation

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 detection rule identifies suspicious child process executions originating from web server processes on Linux systems, indicating that attackers may have exploited web application vulnerabilities such as command injection or remote file inclusion to establish persistence or execute malicious commands.

This brief details how attackers exploit vulnerable web applications or deploy webshells on Linux systems to achieve persistence by executing unusual shell commands from web server processes, potentially leading to payload downloads, reverse shells, or cron-like task implants.

This brief describes how attackers exploit vulnerabilities in web applications to execute suspicious shell commands via web server processes on Linux, enabling persistence, discovery, credential access, and reverse shell establishment, which can lead to full system compromise and data exfiltration.

An attacker can exploit CVE-2026-34151, a path traversal vulnerability in XWiki Platform Old Core through the `/skin/` action endpoint when hosted on Jetty 12+. This allows unauthenticated users to craft URLs to access and download arbitrary files on the server, such as `/etc/passwd` or sensitive XWiki configuration files (e.g., `xwiki.cfg`), potentially leading to information disclosure and further system compromise.

A high-severity vulnerability (CVE-2026-12957) in the Amazon Q Developer Extension for Visual Studio Code allowed attackers to achieve arbitrary code execution and cloud credential theft by automatically loading and executing malicious Model Context Protocol (MCP) server configurations from a `.amazonq/mcp.json` file in a repository without user consent, providing full access to a developer's environment and cloud credentials.

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.