expressjs — Vulnerabilities & Security Advisories 13

Express.js serves as a minimal and flexible Node.js web application framework for building server-side applications and APIs. Historically, it has been susceptible to common web vulnerabilities including Remote Code Execution (RCE), Cross-Site Scripting (XSS), and privilege escalation, often stemming from middleware misconfigurations or input validation flaws. The framework's extensive middleware ecosystem has introduced security challenges, with 13 CVEs documented to date. Notable incidents include the 2018 "prototype pollution" vulnerability affecting multiple packages, demonstrating how core functionality can be compromised. While widely adopted, developers must carefully implement security measures to mitigate risks associated with its lightweight architecture and extensive plugin ecosystem.