composer — Vulnerabilities & Security Advisories 17

Composer is a dependency manager for PHP that enables developers to manage project libraries and their dependencies. Historically, it has been associated with vulnerabilities like remote code execution (RCE), cross-site scripting (XSS), and privilege escalation, often through compromised packages or insecure configurations. Notable security characteristics include its extensive package repository and automatic dependency resolution, which can introduce risks if not properly monitored. Major incidents include supply chain attacks where malicious code was injected into popular packages, leading to widespread exploitation. The tool's widespread adoption in PHP ecosystems makes it a critical component requiring robust security practices to mitigate potential threats from its package ecosystem.