Worked on security hardening for the espressif/developer-portal repository’s CI pipeline, focusing on preventing shell injection vulnerabilities in GitHub Actions workflows. Addressed the risk of arbitrary command execution by implementing input sanitization and routing interpolated workflow values through environment variables instead of direct interpolation. Updated YAML-based workflow definitions to use double-quoted shell variables in run steps, ensuring untrusted inputs were handled securely. This approach improved auditability and maintainability of the CI process while minimizing user impact and downtime. The work leveraged DevOps practices, GitHub Actions, and security best practices to strengthen the overall security posture of the project’s automation.